Search

Your search keyword '"R. Kass"' showing total 1,148 results
Start Over Author "R. Kass"

Refine your results

more »

more »

more »

more »

more »
1,148 results on '"R. Kass"'

3. Structure determination of a bis[4-(di-n-butylamino)phenyl](pyridin-3-yl)borane tetramer highlighting a unique geometric conformation of the core 16-membered ring

Author

Alex Lovstedt, Stephen H. Dempsey, and Steven R. Kass

Subjects
Inorganic Chemistry, Materials Chemistry, Physical and Theoretical Chemistry, Condensed Matter Physics
Abstract

The tetramer of bis(4-di-n-butylaminophenyl)(pyridin-3-yl)borane [systematic name: 2λ4,4λ4,6λ4,8λ4-tetrabora-1,3,5,7(1,3)-tetrapyridinacyclooctaphane-11,31,51,71-tetrakis(ylium)], C132H192B4N12, was synthesized unexpectedly and crystallized. Its structure contains an unusual 16-membered ring core made up of four (pyridin-3-yl)borane groups. The ring adopts a conformation with pseudo-S 4 symmetry that is very different from the two other reported examples of this ring system. Density functional theory (DFT) computations indicate that the stability of the three reported ring conformations is dependent on the substituents on the B atoms, and that the pseudo-S 4 geometry observed in the bis(4-dibutylaminophenyl)(pyridin-3-yl)borane tetramer becomes significantly more stable when phenyl or 2,6-dimethylphenyl groups are attached to the boron centers.

Published
2023

7. Observation and Exploitation of Spin–Orbit Excited Dipole-Bound States in Ion–Molecule Clusters

Author

Wenjin Cao, Xue-Bin Wang, Qinqin Yuan, Hanhui Zhang, Steven R. Kass, and Xiaoguo Zhou

Subjects
Physics, Dipole, Excited state, Bound state, Binding energy, Molecule, General Materials Science, Physical and Theoretical Chemistry, Spin (physics), Ground state, Molecular physics, Ion
Abstract

We report an observation of spin-orbit excited dipole-bound states (DBSs) in arginine-iodide complexes (Arg·I-) by using temperature-dependent, wavelength-resolved "iodide-tagging" negative ion photoelectron spectroscopy. The observed DBSs are bound to the spin-orbit excited I(2P1/2) level of the neutral Arg·I complex in zwitterionic conformations and identified based on the resonant enhancement due to spin-orbit electronic autodetachment from the I(2P1/2) DBS to the I(2P3/2) neutral ground state. The observed DBS binding energies are correlated to the dipole moments of neutral Arg·I isomers and tautomers. This work thus demonstrates a new and generic spectroscopic approach to identify ion-molecule cluster conformations based on their distinguishable dipole moments.

Published
2021

8. Liberating the Anion: Evaluating Weakly Coordinating Cations

Author

Stephen H. Dempsey and Steven R. Kass

Subjects
Organic Chemistry
Abstract

A series of commonly used weakly coordinating cations (WCCs) including tetraalkylammonium, bis(triphenylphosphine)iminium (PPN), P2 and P5 phosphazenium, and tetraphenylphosphonium ions were investigated along with five additional tetraarylphosphonium ions [Ar = 4-Me, 4

Published
2022

9. Observation of Conformational Simplification upon N-Methylation on Amino Acid Iodide Clusters

Author

Xiaoguo Zhou, Xue-Bin Wang, Qinqin Yuan, Steven R. Kass, Wenjin Cao, and Hanhui Zhang

Subjects
chemistry.chemical_classification, Sarcosine, Chemistry, Iodide, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Tautomer, 0104 chemical sciences, Amino acid, Crystallography, chemistry.chemical_compound, Betaine, Cluster (physics), General Materials Science, Amino acid binding, Physical and Theoretical Chemistry, 0210 nano-technology, Conformational isomerism
Abstract

This Letter reports a counterintuitive observation that methylation of the glycine-iodide cluster leads to fewer conformations and spectroscopic simplicity. Cryogenic "iodide-tagging" negative ion photoelectron spectroscopy (NIPES) is used to probe specific binding sites of three N-methylated glycine derivatives, i.e., N-methylglycine (sarcosine), N,N-dimethylglycine, and N,N,N-trimethylglycine (glycine betaine). NIPES reveals a progressive spectral simplification of the iodide clusters with increasing methylation due to fewer contributing structures. Low energy conformers and tautomers of each cluster are computationally identified, and those observed in the experiments are assigned based on excellent agreement between the NIPE spectra and theoretical simulations. Zwitterionic cluster structures are found to be less stable than their canonical forms and do not contribute to the observed spectra. This work demonstrates the power of iodide-tagging NIPES in probing conformations of amino acid-iodide clusters and provides a molecular level understanding on the effect of methyl substitution on amino acid binding sites.

Published
2021

13. Search for an Axionlike Particle in B Meson Decays

Author

J P, Lees, V, Poireau, V, Tisserand, E, Grauges, A, Palano, G, Eigen, D N, Brown, Yu G, Kolomensky, M, Fritsch, H, Koch, T, Schroeder, R, Cheaib, C, Hearty, T S, Mattison, J A, McKenna, R Y, So, V E, Blinov, A R, Buzykaev, V P, Druzhinin, V B, Golubev, E A, Kozyrev, E A, Kravchenko, A P, Onuchin, S I, Serednyakov, Yu I, Skovpen, E P, Solodov, K Yu, Todyshev, A J, Lankford, B, Dey, J W, Gary, O, Long, A M, Eisner, W S, Lockman, W, Panduro Vazquez, D S, Chao, C H, Cheng, B, Echenard, K T, Flood, D G, Hitlin, J, Kim, Y, Li, D X, Lin, S, Middleton, T S, Miyashita, P, Ongmongkolkul, J, Oyang, F C, Porter, M, Röhrken, Z, Huard, B T, Meadows, B G, Pushpawela, M D, Sokoloff, L, Sun, J G, Smith, S R, Wagner, D, Bernard, M, Verderi, D, Bettoni, C, Bozzi, R, Calabrese, G, Cibinetto, E, Fioravanti, I, Garzia, E, Luppi, V, Santoro, A, Calcaterra, R, de Sangro, G, Finocchiaro, S, Martellotti, P, Patteri, I M, Peruzzi, M, Piccolo, M, Rotondo, A, Zallo, S, Passaggio, C, Patrignani, I, Flood, N, Nguyen, B J, Shuve, H M, Lacker, B, Bhuyan, U, Mallik, C, Chen, J, Cochran, S, Prell, A V, Gritsan, N, Arnaud, M, Davier, F, Le Diberder, A M, Lutz, G, Wormser, D J, Lange, D M, Wright, J P, Coleman, E, Gabathuler, D E, Hutchcroft, D J, Payne, C, Touramanis, A J, Bevan, F, Di Lodovico, R, Sacco, G, Cowan, Sw, Banerjee, C L, Davis, A G, Denig, W, Gradl, K, Griessinger, A, Hafner, K R, Schubert, R J, Barlow, G D, Lafferty, R, Cenci, A, Jawahery, D A, Roberts, R, Cowan, S H, Robertson, R M, Seddon, N, Neri, F, Palombo, L, Cremaldi, R, Godang, D J, Summers, P, Taras, G, De Nardo, C, Sciacca, G, Raven, C P, Jessop, J M, LoSecco, K, Honscheid, R, Kass, A, Gaz, M, Margoni, M, Posocco, G, Simi, F, Simonetto, R, Stroili, S, Akar, E, Ben-Haim, M, Bomben, G R, Bonneaud, G, Calderini, J, Chauveau, G, Marchiori, J, Ocariz, M, Biasini, E, Manoni, A, Rossi, G, Batignani, S, Bettarini, M, Carpinelli, G, Casarosa, M, Chrzaszcz, M, De Nuccio, F, Forti, M A, Giorgi, A, Lusiani, B, Oberhof, E, Paoloni, M, Rama, G, Rizzo, J J, Walsh, L, Zani, A J S, Smith, F, Anulli, R, Faccini, F, Ferrarotto, F, Ferroni, A, Pilloni, G, Piredda, C, Bünger, S, Dittrich, O, Grünberg, M, Heß, T, Leddig, C, Voß, R, Waldi, T, Adye, F F, Wilson, S, Emery, G, Vasseur, D, Aston, C, Cartaro, M R, Convery, J, Dorfan, W, Dunwoodie, M, Ebert, R C, Field, B G, Fulsom, M T, Graham, C, Hast, W R, Innes, P, Kim, D W G S, Leith, S, Luitz, D B, MacFarlane, D R, Muller, H, Neal, B N, Ratcliff, A, Roodman, M K, Sullivan, J, Va'vra, W J, Wisniewski, M V, Purohit, J R, Wilson, A, Randle-Conde, S J, Sekula, H, Ahmed, N, Tasneem, M, Bellis, P R, Burchat, E M T, Puccio, M S, Alam, J A, Ernst, R, Gorodeisky, N, Guttman, D R, Peimer, A, Soffer, S M, Spanier, J L, Ritchie, R F, Schwitters, J M, Izen, X C, Lou, F, Bianchi, F, De Mori, A, Filippi, D, Gamba, L, Lanceri, L, Vitale, F, Martinez-Vidal, A, Oyanguren, J, Albert, A, Beaulieu, F U, Bernlochner, G J, King, R, Kowalewski, T, Lueck, C, Miller, I M, Nugent, J M, Roney, R J, Sobie, T J, Gershon, P F, Harrison, T E, Latham, R, Prepost, S L, Wu, Lees, J, Poireau, V, Tisserand, V, Grauges, E, Palano, A, Eigen, G, Brown, D, Kolomensky, Y, Fritsch, M, Koch, H, Schroeder, T, Cheaib, R, Hearty, C, Mattison, T, Mckenna, J, So, R, Blinov, V, Buzykaev, A, Druzhinin, V, Golubev, V, Kozyrev, E, Kravchenko, E, Onuchin, A, Serednyakov, S, Skovpen, Y, Solodov, E, Todyshev, K, Lankford, A, Dey, B, Gary, J, Long, O, Eisner, A, Lockman, W, Panduro Vazquez, W, Chao, D, Cheng, C, Echenard, B, Flood, K, Hitlin, D, Kim, J, Li, Y, Lin, D, Middleton, S, Miyashita, T, Ongmongkolkul, P, Oyang, J, Porter, F, Röhrken, M, Huard, Z, Meadows, B, Pushpawela, B, Sokoloff, M, Sun, L, Smith, J, Wagner, S, Bernard, D, Verderi, M, Bettoni, D, Bozzi, C, Calabrese, R, Cibinetto, G, Fioravanti, E, Garzia, I, Luppi, E, Santoro, V, Calcaterra, A, de Sangro, R, Finocchiaro, G, Martellotti, S, Patteri, P, Peruzzi, I, Piccolo, M, Rotondo, M, Zallo, A, Passaggio, S, Patrignani, C, Flood, I, Nguyen, N, Shuve, B, Lacker, H, Bhuyan, B, Mallik, U, Chen, C, Cochran, J, Prell, S, Gritsan, A, Arnaud, N, Davier, M, Le Diberder, F, Lutz, A, Wormser, G, Lange, D, Wright, D, Coleman, J, Gabathuler, E, Hutchcroft, D, Payne, D, Touramanis, C, Bevan, A, Di Lodovico, F, Sacco, R, Cowan, G, Banerjee, S, Davis, C, Denig, A, Gradl, W, Griessinger, K, Hafner, A, Schubert, K, Barlow, R, Lafferty, G, Cenci, R, Jawahery, A, Roberts, D, Cowan, R, Robertson, S, Seddon, R, Neri, N, Palombo, F, Cremaldi, L, Godang, R, Summers, D, Taras, P, De Nardo, G, Sciacca, C, Raven, G, Jessop, C, Losecco, J, Honscheid, K, Kass, R, Gaz, A, Margoni, M, Posocco, M, Simi, G, Simonetto, F, Stroili, R, Akar, S, Ben-Haim, E, Bomben, M, Bonneaud, G, Calderini, G, Chauveau, J, Marchiori, G, Ocariz, J, Biasini, M, Manoni, E, Rossi, A, Batignani, G, Bettarini, S, Carpinelli, M, Casarosa, G, Chrzaszcz, M, De Nuccio, M, Forti, F, Giorgi, M, Lusiani, A, Oberhof, B, Paoloni, E, Rama, M, Rizzo, G, Walsh, J, Zani, L, Smith, A, Anulli, F, Faccini, R, Ferrarotto, F, Ferroni, F, Pilloni, A, Piredda, G, Bünger, C, Dittrich, S, Grünberg, O, Heß, M, Leddig, T, Voß, C, Waldi, R, Adye, T, Wilson, F, Emery, S, Vasseur, G, Aston, D, Cartaro, C, Convery, M, Dorfan, J, Dunwoodie, W, Ebert, M, Field, R, Fulsom, B, Graham, M, Hast, C, Innes, W, Kim, P, Leith, D, Luitz, S, Macfarlane, D, Muller, D, Neal, H, Ratcliff, B, Roodman, A, Sullivan, M, Va'Vra, J, Wisniewski, W, Purohit, M, Wilson, J, Randle-Conde, A, Sekula, S, Ahmed, H, Tasneem, N, Bellis, M, Burchat, P, Puccio, E, Alam, M, Ernst, J, Gorodeisky, R, Guttman, N, Peimer, D, Soffer, A, Spanier, S, Ritchie, J, Schwitters, R, Izen, J, Lou, X, Bianchi, F, De Mori, F, Filippi, A, Gamba, D, Lanceri, L, Vitale, L, Martinez-Vidal, F, Oyanguren, A, Albert, J, Beaulieu, A, Bernlochner, F, King, G, Kowalewski, R, Lueck, T, Miller, C, Nugent, I, Roney, J, Sobie, R, Gershon, T, Harrison, P, Latham, T, Prepost, R, Wu, S, Lees, J P, Brown, D N, Kolomensky, Yu G, Mattison, T S, McKenna, J A, So, R Y, Blinov, V E, Buzykaev, A R, Druzhinin, V P, Golubev, V B, Kozyrev, E A, Kravchenko, E A, Onuchin, A P, Serednyakov, S I, Skovpen, Yu I, Solodov, E P, Todyshev, K Yu, Lankford, A J, Gary, J W, Eisner, A M, Lockman, W S, Chao, D S, Cheng, C H, Flood, K T, Hitlin, D G, Lin, D X, Miyashita, T S, Porter, F C, Meadows, B T, Pushpawela, B G, Sokoloff, M D, Smith, J G, Wagner, S R, Peruzzi, I M, Shuve, B J, Lacker, H M, Gritsan, A V, Lutz, A M, Lange, D J, Wright, D M, Coleman, J P, Hutchcroft, D E, Payne, D J, Bevan, A J, Banerjee, Sw, Davis, C L, Denig, A G, Schubert, K R, Barlow, R J, Lafferty, G D, Roberts, D A, Robertson, S H, Seddon, R M, Summers, D J, Jessop, C P, LoSecco, J M, Bonneaud, G R, Giorgi, M A, Walsh, J J, Smith, A J S, Wilson, F F, Convery, M R, Field, R C, Fulsom, B G, Graham, M T, Innes, W R, Leith, D W G S, MacFarlane, D B, Muller, D R, Ratcliff, B N, Sullivan, M K, Va'vra, J, Wisniewski, W J, Purohit, M V, Wilson, J R, Sekula, S J, Burchat, P R, Puccio, E M T, Alam, M S, Ernst, J A, Peimer, D R, Spanier, S M, Ritchie, J L, Schwitters, R F, Izen, J M, Lou, X C, Bernlochner, F U, King, G J, Nugent, I M, Roney, J M, Sobie, R J, Gershon, T J, Harrison, P F, Latham, T E, Wu, S L, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, BaBar, Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. N., Kolomensky, Y. G., Fritsch, M., Koch, H., Schroeder, T., Cheaib, R., Hearty, C., Mattison, T. S., Mckenna, J. A., So, R. Y., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kozyrev, E. A., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Y. I., Solodov, E. P., Todyshev, K. Y., Lankford, A. J., Dey, B., Gary, J. W., Long, O., Eisner, A. M., Lockman, W. S., Panduro Vazquez, W., Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Kim, J., Li, Y., Lin, D. X., Middleton, S., Miyashita, T. S., Ongmongkolkul, P., Oyang, J., Porter, F. C., Rohrken, M., Huard, Z., Meadows, B. T., Pushpawela, B. G., Sokoloff, M. D., Sun, L., Smith, J. G., Wagner, S. R., Bernard, D., Verderi, M., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Santoro, V., Calcaterra, A., De Sangro, R., Finocchiaro, G., Martellotti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rotondo, M., Zallo, A., Passaggio, S., Patrignani, C., Flood, I., Nguyen, N., Shuve, B. J., Lacker, H. M., Bhuyan, B., Mallik, U., Chen, C., Cochran, J., Prell, S., Gritsan, A. V., Arnaud, N., Davier, M., Le Diberder, F., Lutz, A. M., Wormser, G., Lange, D. J., Wright, D. M., Coleman, J. P., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Cowan, G., Banerjee, S. W., Davis, C. L., Denig, A. G., Gradl, W., Griessinger, K., Hafner, A., Schubert, K. R., Barlow, R. J., Lafferty, G. D., Cenci, R., Jawahery, A., Roberts, D. A., Cowan, R., Robertson, S. H., Seddon, R. M., Neri, N., Palombo, F., Cremaldi, L., Godang, R., Summers, D. J., Taras, P., De Nardo, G., Sciacca, C., Raven, G., Jessop, C. P., Losecco, J. M., Honscheid, K., Kass, R., Gaz, A., Margoni, M., Posocco, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Calderini, G., Chauveau, J., Marchiori, G., Ocariz, J., Biasini, M., Manoni, E., Rossi, A., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Chrzaszcz, M., De Nuccio, M., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Rama, M., Rizzo, G., Walsh, J. J., Zani, L., Smith, A. J. S., Anulli, F., Faccini, R., Ferrarotto, F., Ferroni, F., Pilloni, A., Piredda, G., Bunger, C., Dittrich, S., Grunberg, O., Hess, M., Leddig, T., Voss, C., Waldi, R., Adye, T., Wilson, F. F., Emery, S., Vasseur, G., Aston, D., Cartaro, C., Convery, M. R., Dorfan, J., Dunwoodie, W., Ebert, M., Field, R. C., Fulsom, B. G., Graham, M. T., Hast, C., Innes, W. R., Kim, P., Leith, D. W. G. S., Luitz, S., Macfarlane, D. B., Muller, D. R., Neal, H., Ratcliff, B. N., Roodman, A., Sullivan, M. K., Va'Vra, J., Wisniewski, W. J., Purohit, M. V., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Ahmed, H., Tasneem, N., Bellis, M., Burchat, P. R., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Spanier, S. M., Ritchie, J. L., Schwitters, R. F., Izen, J. M., Lou, X. C., Bianchi, F., De Mori, F., Filippi, A., Gamba, D., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Albert, J., Beaulieu, A., Bernlochner, F. U., King, G. J., Kowalewski, R., Lueck, T., Miller, C., Nugent, I. M., Roney, J. M., Sobie, R. J., Gershon, T. J., Harrison, P. F., Latham, T. E., Prepost, R., Wu, S. L., Mckenna, J A, Losecco, J M, and Macfarlane, D B

Subjects
flavor changing, General Physics and Astronomy, B meson, High Energy Physics - Experiment, current: constraint, High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], QC, B meson decay, scale: electroweak interaction, article, electron positron: colliding beams, mass dependence, The standard model, Confidence level, PEP-II, axion-like particles, axion: mass, photon: pair production, boson, axionlike particles, FOS: Physical sciences, coupling constant: upper limit, Bottom mesons, electron positron: annihilation, meson, Physics::Geophysics, BABAR experiment, B: rare decay, Bosons, Electroweak boson, axionlike particle, High Energy Physics::Phenomenology, ALPs, Particle ma, Upper limit, Bottom meson, Rare decays, SLAC PEP Stor, current, axion: radiative decay, HEP, Electroweak scale, Germanium compound, Orders of magnitude, Rare decay, axion, Hadron, BaBar, coupling: (axion 2photon), High Energy Physics::Experiment, experimental results
Abstract

Axion-like particles (ALPs) are predicted in many extensions of the Standard Model, and their masses can naturally be well below the electroweak scale. In the presence of couplings to electroweak bosons, these particles could be emitted in flavor-changing $B$ meson decays. We report herein a search for an ALP, $a$, in the reaction $B^\pm\rightarrow K^\pm a$, $a\rightarrow\gamma\gamma$ using data collected by the BABAR experiment at SLAC. No significant signal is observed, and 90% confidence level upper limits on the ALP coupling to electroweak bosons are derived as a function of ALP mass, improving current constraints by several orders of magnitude in the range $0.175\,\,\mathrm{GeV} < m_a < 4.78\,\,\mathrm{GeV}$., Comment: 11 pages, 8 figures, submitted to Phys. Rev. Lett

Published
2022

15. Electrostatically Enhanced Phosphoric Acids and Their Applications in Asymmetric Friedel–Crafts Alkylations

Author

Jie Ma and Steven R. Kass

Subjects
Steric effects, 010405 organic chemistry, Chemistry, Organic Chemistry, Enantioselective synthesis, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Catalysis, Ion, chemistry.chemical_compound, Organic chemistry, Reactivity (chemistry), Selectivity, Phosphoric acid, Friedel–Crafts reaction
Abstract

A series of electrostatically enhanced phosphoric acid catalysts were synthesized and studied. These compounds possess two positively charged N-octylpyridinium or triarylphosphonium ion centers at the 3,3'-positions of the (R)-BINOL backbone to enhance reactivity and provide needed steric bulk for enantioselective transformations. Catalytic activities for Friedel-Crafts alkylations of indoles with trans-β-nitrostyrenes were studied. Both types of catalysts accelerate reaction conversions relative to noncharged analogues, and good enantioselectivities up to 90% ee are observed with the phosphonium-ion-tagged phosphoric acids. This transformation also can be scaled up to synthetically useful amounts, affording >250 mg of product without losing any reactivity or selectivity.

Published
2019

16. Observation of Conformational Simplification upon

Author

Wenjin, Cao, Hanhui, Zhang, Qinqin, Yuan, Xiaoguo, Zhou, Steven R, Kass, and Xue-Bin, Wang

Abstract

This Letter reports a counterintuitive observation that methylation of the glycine-iodide cluster leads to fewer conformations and spectroscopic simplicity. Cryogenic "iodide-tagging" negative ion photoelectron spectroscopy (NIPES) is used to probe specific binding sites of three

Published
2021

18. Light meson spectroscopy from Dalitz plot analyses ηc decays to η0K + K − , η0π + π − , and ηπ + π − produced in two-photon interactions

Author

J. ???P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. ???N. Brown, Yu. ???G. Kolomensky, M. Fritsch, H. Koch, T. Schroeder, R. Cheaib, C. Hearty, T. ???S. Mattison, J. ???A. McKenna, R. ???Y. So, V. ???E. Blinov, A. ???R. Buzykaev, V. ???P. Druzhinin, V. ???B. Golubev, E. ???A. Kozyrev, E. ???A. Kravchenko, A. ???P. Onuchin, S. ???I. Serednyakov, Yu. ???I. Skovpen, E. ???P. Solodov, K. ???Yu. Todyshev, A. ???J. Lankford, B. Dey, J. ???W. Gary, O. Long, A. ???M. Eisner, W. ???S. Lockman, W. Panduro Vazquez, D. ???S. Chao, C. ???H. Cheng, B. Echenard, K. ???T. Flood, D. ???G. Hitlin, J. Kim, Y. Li, D. ???X. Lin, T. ???S. Miyashita, P. Ongmongkolkul, J. Oyang, F. ???C. Porter, M. R??hrken, Z. Huard, B. ???T. Meadows, B. ???G. Pushpawela, M. ???D. Sokoloff, L. Sun, J. ???G. Smith, S. ???R. Wagner, D. Bernard, M. Verderi, D. Bettoni, C. Bozzi, R. Calabrese, G. Cibinetto, E. Fioravanti, I. Garzia, E. Luppi, V. Santoro, A. Calcaterra, R. de Sangro, G. Finocchiaro, S. Martellotti, P. Patteri, I. ???M. Peruzzi, M. Piccolo, M. Rotondo, A. Zallo, S. Passaggio, C. Patrignani, B. ???J. Shuve, H. ???M. Lacker, B. Bhuyan, U. Mallik, C. Chen, J. Cochran, S. Prell, A. ???V. Gritsan, N. Arnaud, M. Davier, F. Le Diberder, A. ???M. Lutz, G. Wormser, D. ???J. Lange, D. ???M. Wright, J. ???P. Coleman, E. Gabathuler, D. ???E. Hutchcroft, D. ???J. Payne, C. Touramanis, A. ???J. Bevan, F. Di Lodovico, R. Sacco, G. Cowan, Sw. Banerjee, C. ???L. Davis, A. ???G. Denig, W. Gradl, K. Griessinger, A. Hafner, K. ???R. Schubert, R. ???J. Barlow, G. ???D. Lafferty, R. Cenci, A. Jawahery, D. ???A. Roberts, R. Cowan, S. ???H. Robertson, R. ???M. Seddon, N. Neri, F. Palombo, L. Cremaldi, R. Godang, D. ???J. Summers, P. Taras, G. De Nardo, C. Sciacca, G. Raven, C. ???P. Jessop, J. ???M. LoSecco, K. Honscheid, R. Kass, A. Gaz, M. Margoni, M. Posocco, G. Simi, F. Simonetto, R. Stroili, S. Akar, E. Ben-Haim, M. Bomben, G. ???R. Bonneaud, G. Calderini, J. Chauveau, G. Marchiori, J. Ocariz, M. Biasini, E. Manoni, A. Rossi, G. Batignani, S. Bettarini, M. Carpinelli, G. Casarosa, M. Chrzaszcz, F. Forti, M. ???A. Giorgi, A. Lusiani, B. Oberhof, E. Paoloni, M. Rama, G. Rizzo, J. ???J. Walsh, L. Zani, A. ???J. ???S. Smith, F. Anulli, R. Faccini, F. Ferrarotto, F. Ferroni, A. Pilloni, G. Piredda, C. B??nger, S. Dittrich, O. Gr??nberg, M. He??, T. Leddig, C. Vo??, R. Waldi, T. Adye, F. ???F. Wilson, S. Emery, G. Vasseur, D. Aston, C. Cartaro, M. ???R. Convery, J. Dorfan, W. Dunwoodie, M. Ebert, R. ???C. Field, B. ???G. Fulsom, M. ???T. Graham, C. Hast, W. ???R. Innes, P. Kim, D. ???W. ???G. ???S. Leith, S. Luitz, D. ???B. MacFarlane, D. ???R. Muller, H. Neal, B. ???N. Ratcliff, A. Roodman, M. ???K. Sullivan, J. Va???vra, W. ???J. Wisniewski, M. ???V. Purohit, J. ???R. Wilson, A. Randle-Conde, S. ???J. Sekula, H. Ahmed, M. Bellis, P. ???R. Burchat, E. ???M. ???T. Puccio, M. ???S. Alam, J. ???A. Ernst, R. Gorodeisky, N. Guttman, D. ???R. Peimer, A. Soffer, S. ???M. Spanier, J. ???L. Ritchie, R. ???F. Schwitters, J. ???M. Izen, X. ???C. Lou, F. Bianchi, F. De Mori, A. Filippi, D. Gamba, L. Lanceri, L. Vitale, F. Martinez-Vidal, A. Oyanguren, J. Albert, A. Beaulieu, F. ???U. Bernlochner, G. ???J. King, R. Kowalewski, T. Lueck, I. ???M. Nugent, J. ???M. Roney, R. ???J. Sobie, N. Tasneem, T. ???J. Gershon, P. ???F. Harrison, T. ???E. Latham, R. Prepost, S. ???L. Wu, Lees, J. ???P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. ???N., Kolomensky, Yu. ???G., Fritsch, M., Koch, H., Schroeder, T., Cheaib, R., Hearty, C., Mattison, T. ???S., Mckenna, J. ???A., So, R. ???Y., Blinov, V. ???E., Buzykaev, A. ???R., Druzhinin, V. ???P., Golubev, V. ???B., Kozyrev, E. ???A., Kravchenko, E. ???A., Onuchin, A. ???P., Serednyakov, S. ???I., Skovpen, Yu. ???I., Solodov, E. ???P., Todyshev, K. ???Yu., Lankford, A. ???J., Dey, B., Gary, J. ???W., Long, O., Eisner, A. ???M., Lockman, W. ???S., Panduro Vazquez, W., Chao, D. ???S., Cheng, C. ???H., Echenard, B., Flood, K. ???T., Hitlin, D. ???G., Kim, J., Li, Y., Lin, D. ???X., Miyashita, T. ???S., Ongmongkolkul, P., Oyang, J., Porter, F. ???C., R??hrken, M., Huard, Z., Meadows, B. ???T., Pushpawela, B. ???G., Sokoloff, M. ???D., Sun, L., Smith, J. ???G., Wagner, S. ???R., Bernard, D., Verderi, M., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Santoro, V., Calcaterra, A., de Sangro, R., Finocchiaro, G., Martellotti, S., Patteri, P., Peruzzi, I. ???M., Piccolo, M., Rotondo, M., Zallo, A., Passaggio, S., Patrignani, C., Shuve, B. ???J., Lacker, H. ???M., Bhuyan, B., Mallik, U., Chen, C., Cochran, J., Prell, S., Gritsan, A. ???V., Arnaud, N., Davier, M., Le Diberder, F., Lutz, A. ???M., Wormser, G., Lange, D. ???J., Wright, D. ???M., Coleman, J. ???P., Gabathuler, E., Hutchcroft, D. ???E., Payne, D. ???J., Touramanis, C., Bevan, A. ???J., Di Lodovico, F., Sacco, R., Cowan, G., Banerjee, Sw., Davis, C. ???L., Denig, A. ???G., Gradl, W., Griessinger, K., Hafner, A., Schubert, K. ???R., Barlow, R. ???J., Lafferty, G. ???D., Cenci, R., Jawahery, A., Roberts, D. ???A., Cowan, R., Robertson, S. ???H., Seddon, R. ???M., Neri, N., Palombo, F., Cremaldi, L., Godang, R., Summers, D. ???J., Taras, P., De Nardo, G., Sciacca, C., Raven, G., Jessop, C. ???P., Losecco, J. ???M., Honscheid, K., Kass, R., Gaz, A., Margoni, M., Posocco, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. ???R., Calderini, G., Chauveau, J., Marchiori, G., Ocariz, J., Biasini, M., Manoni, E., Rossi, A., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Chrzaszcz, M., Forti, F., Giorgi, M. ???A., Lusiani, A., Oberhof, B., Paoloni, E., Rama, M., Rizzo, G., Walsh, J. ???J., Zani, L., Smith, A. ???J. ???S., Anulli, F., Faccini, R., Ferrarotto, F., Ferroni, F., Pilloni, A., Piredda, G., B??nger, C., Dittrich, S., Gr??nberg, O., He??, M., Leddig, T., Vo??, C., Waldi, R., Adye, T., Wilson, F. ???F., Emery, S., Vasseur, G., Aston, D., Cartaro, C., Convery, M. ???R., Dorfan, J., Dunwoodie, W., Ebert, M., Field, R. ???C., Fulsom, B. ???G., Graham, M. ???T., Hast, C., Innes, W. ???R., Kim, P., Leith, D. ???W. ???G. ???S., Luitz, S., Macfarlane, D. ???B., Muller, D. ???R., Neal, H., Ratcliff, B. ???N., Roodman, A., Sullivan, M. ???K., Va???vra, J., Wisniewski, W. ???J., Purohit, M. ???V., Wilson, J. ???R., Randle-Conde, A., Sekula, S. ???J., Ahmed, H., Bellis, M., Burchat, P. ???R., Puccio, E. ???M. ???T., Alam, M. ???S., Ernst, J. ???A., Gorodeisky, R., Guttman, N., Peimer, D. ???R., Soffer, A., Spanier, S. ???M., Ritchie, J. ???L., Schwitters, R. ???F., Izen, J. ???M., Lou, X. ???C., Bianchi, F., De Mori, F., Filippi, A., Gamba, D., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Albert, J., Beaulieu, A., Bernlochner, F. ???U., King, G. ???J., Kowalewski, R., Lueck, T., Nugent, I. ???M., Roney, J. ???M., Sobie, R. ???J., Tasneem, N., Gershon, T. ???J., Harrison, P. ???F., Latham, T. ???E., Prepost, R., and Wu, S. ???L.

Subjects
Belle II, SuperKEKB, Dalitz, Dalitz plot analyses, light meson, Light meson spectroscopy, Dalitz plot analyse
Abstract

We study the processes γγ → ηc → η0KþK−, η0πþπ−, and ηπþπ− using a data sample of 519 fb−1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e+e− collider at center-of-mass energies at and near the Υ(nS) (n = 2, 3, 4) resonances. This is the first observation of the decay ηc → η0KþK− and we measure the branching fraction Γðηc → η0KþK−Þ=ðΓðηc → η0πþπ−Þ 1⁄4 0.644 0.039stat 0.032sys. Significant interference is observed between γγ → ηc → ηπþπ− and the nonresonant two-photon process γγ → ηπþπ−. A Dalitz plot analysis is performed of ηc decays to η0KþK−, η0πþπ−, and ηπþπ−. Combined with our previous analysis of ηc → KK ̄ π, we measure the K 0ð1430Þ parameters and the ratio between its η0K and πK couplings. The decay ηc → η0πþπ− is dominated by the f0ð2100Þ resonance, also observed in J=ψ radiative decays. A new a0(1700)→ ηπ resonance is observed in the ηc → ηπþπ− channel. We also compare ηc decays to η and η0 final states in association with scalar mesons as they relate to the identification of the scalar glueball.

Published
2021

19. Neurologic Disease in HIV Infection

Author

Eric A. Goethe, Naomi R. Kass, and Joseph S. Kass

Subjects
Microglia, business.industry, Monocyte, Central nervous system, Human immunodeficiency virus (HIV), Immune dysregulation, medicine.disease, medicine.disease_cause, medicine.anatomical_structure, Immune system, Acquired immunodeficiency syndrome (AIDS), Immunology, Medicine, Macrophage, business
Abstract

First described in 1981, acquired immunodeficiency syndrome (AIDS), presents as a constellation of signs, symptoms, and opportunistic diseases reflecting the human immunodeficiency virus’s (HIV) infection, dysregulation, and destruction of immune cells involved primarly in the cellular immune response such as CD4+ T lymphocytes but also including members of the monocyte/macrophage lineage such as central nervous system (CNS) microglia. The Centers for Disease Control and Prevention (CDC) defined AIDS as a CD4+ T-lymphocyte count below 200 cells/microliter and also identified a number of AIDS-defining conditions, both opportunistic diseases arising from a devastated cellular immune as well as conditions manifesting as a direct consequence of the immune dysregulation characteristic of HIV infection. The entire neuroaxis is susceptible to the HIV-related damage, and many AIDS-defining conditions manifest in the central nervous system (CNS).

Published
2020

21. THE ETHICS OF EVERYDAY LIFE

Author

Amy A. Kass, Richard John Neuhaus, Leon R. Kass, Gilbert C. Meilaender, Timothy Fuller, and Mark Schwehn

Subjects
Series (mathematics), Aesthetics, Sociology, Everyday life
Published
2020

23. Cover Image

Author

Curtis Payne and Steven R. Kass

Subjects
Organic Chemistry, Physical and Theoretical Chemistry
Published
2020

24. Cryogenic 'Iodide-Tagging' Photoelectron Spectroscopy: A Sensitive Probe for Specific Binding Sites of Amino Acids

Author

Xue-Bin Wang, Wenjin Cao, Steven R. Kass, Qinqin Yuan, Marat Valiev, Hanhui Zhang, and Xiaoguo Zhou

Subjects
chemistry.chemical_classification, Binding Sites, Biomolecule, Electrospray ionization, Photoelectron Spectroscopy, Iodide, Glycine, Iodides, Ion, Amino acid, Crystallography, chemistry, X-ray photoelectron spectroscopy, General Materials Science, Ion trap, Physical and Theoretical Chemistry, Binding site
Abstract

This work showcases cryogenic and temperature-dependent "iodide-tagging" photoelectron spectroscopy to probe specific binding sites of amino acids using the glycine-iodide complex (Gly·I-) as a case study. Multiple Gly·I- isomers were generated from ambient electrospray ionization and kinetically isolated in a cryogenic ion trap. These structures were characterized with temperature-dependent "iodide-tagging" negative ion photoelectron spectroscopy (NIPES), where iodide was used as the "messenger" to interpret electronic energetics and structural information of various Gly·I- isomers. Accompanied by theoretical computations and Franck-Condon simulations, a total of five cluster structures have been identified along with their various binding motifs. This work demonstrates that "iodide-tagging" NIPES is a powerful general means for probing specific binding interactions in biological molecules of interest.

Published
2020

26. Synthesis of Cyclic Organic Carbonates Using Atmospheric Pressure CO2 and Charge-Containing Thiourea Catalysts

Author

Mario Waser, Yang Fan, Steven R. Kass, Maximilian Tiffner, Raphaël Robiette, Johannes Schörgenhumer, and UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity

Subjects
Green chemistry, 010405 organic chemistry, Organic Chemistry, Reactive intermediate, Substrate (chemistry), Epoxide, 010402 general chemistry, Ring (chemistry), 01 natural sciences, 0104 chemical sciences, Catalysis, chemistry.chemical_compound, Nucleophile, Thiourea, chemistry, Organic chemistry
Abstract

Cycloadditions of epoxides with CO2 to synthesize cyclic five-membered ring organic carbonates are of broad interest from a synthetic, environmental, and green chemistry perspective, and the development of effective catalysts for these transformations is an ongoing challenge. A series of eight charge-containing thiourea salts that catalyze these reactions under mild conditions (i.e., 60 °C and atmospheric CO2 pressure) are reported. Substrate scope and mechanistic studies were also carried out, isotope effects were measured, and a reactive intermediate was isolated revealing a surprising pathway in which a thiourea catalyst serves as a nucleophile in the cleavage of the epoxide ring.

Published
2018

27. Asymmetric Arylation of 2,2,2-Trifluoroacetophenones Catalyzed by Chiral Electrostatically-Enhanced Phosphoric Acids

Author

Steven R. Kass and Jie Ma

Subjects
010405 organic chemistry, Chemistry, Aryl, Organic Chemistry, 010402 general chemistry, 01 natural sciences, Biochemistry, 0104 chemical sciences, Ion, Catalysis, chemistry.chemical_compound, Organic chemistry, Phosphonium, Physical and Theoretical Chemistry
Abstract

A series of highly reactive metal-free chiral phosphoric acids possessing positively charged phosphonium ion substituents are reported and have been applied to Friedel-Crafts alkylations of indoles and 2,2,2-trifluoromethyl aryl ketones. These catalysts are orders-of-magnitude more active and have similar or better enantioselectivities than their noncharged analogues. High tolerance to a range of substrates with electron-withdrawing and electron-donating substituents was also observed.

Published
2018

28. Enantioselective Friedel–Crafts Alkylation between Nitroalkenes and Indoles Catalyzed by Charge Activated Thiourea Organocatalysts

Author

Steven R. Kass and Yang Fan

Subjects
010405 organic chemistry, Organic Chemistry, Heteroatom, Enantioselective synthesis, Substituent, 010402 general chemistry, 01 natural sciences, Medicinal chemistry, 0104 chemical sciences, Catalysis, chemistry.chemical_compound, Thiourea organocatalysis, Thiourea, chemistry, Organic chemistry, Pyridinium, Friedel–Crafts reaction
Abstract

A series of methylated and octylated pyridinium and quinolinium containing thiourea salts with a chiral 2-indanol substituent are reported. These organocatalysts are positively charged analogues of privileged bis(3,5-trifluoromethyl)phenyl substituted thioureas, and are found to be much more active catalysts despite the absence of an additional hydrogen bond donor or acceptor site (i.e., the presence of a heteroatom-hydrogen or heteroatom). Friedel-Crafts reactions of trans-β-nitorostyrenes with indoles are examined, and good yields and enantioselectivities are obtained. Mechanistic studies indicate that this is a second-order transformation under the employed conditions, and is consistent with the dimer of the thiourea being the active catalyst. Charged organocatalysts, consequently, represent an attractive design strategy for catalyst development.

Published
2017

29. Founding God’s Nation : Reading Exodus

Author

Leon R Kass and Leon R Kass

Subjects
Religious materials, Literary criticism, Commentaries, Bible. Exodus--Commentaries, Bible. Exodus
Abstract

In this long†‘awaited follow†‘up to his 2003 book on Genesis, humanist scholar Leon Kass explores how Exodus raises and then answers the central political questions of what defines a nation and how a nation should govern itself. Considered by some the most important book in the Hebrew Bible, Exodus tells the story of the Jewish people from their enslavement in Egypt through their liberation under Moses's leadership to their covenantal founding at Sinai and the building of the Tabernacle. In Kass's analysis, these events begin the slow process of learning how to stop thinking like slaves and become an independent people. The Israelites ultimately found their nation on three elements: a shared narrative that instills empathy for the poor and the suffering, the uplifting rule of a moral law, and devotion to a higher common purpose. These elements, Kass argues, remain the essential principles for any freedom-loving nation today.

Published
2021

30. Reactions of doubly deprotonated 2,6-naphthalenedicarboxylic acid with alcohols: Proton transfer versus solvation

Author

Richard A. J. O'Hair, Jacob Schmidt, Matthew M. Meyer, Alireza Fattahi, Steven R. Kass, and George N. Khairallah

Subjects
Proton, 010405 organic chemistry, Chemistry, ved/biology, Photodissociation, ved/biology.organism_classification_rank.species, Solvation, Protonation, 010402 general chemistry, Condensed Matter Physics, Photochemistry, 01 natural sciences, 0104 chemical sciences, Ion, Deprotonation, Computational chemistry, Molecule, Physical and Theoretical Chemistry, Instrumentation, Spectroscopy, Conjugate acid
Abstract

Electrospray ionization of 2,6-naphthalenedicarboxylic acid readily affords its doubly deprotonated dicarboxylate dianion (12−). This species clusters with background water and added alcohols in an ion trap at ∼10−3 Torr. Sequential solvation is observed to afford mono and dicoordinated ions. Surprisingly, the latter cluster (12−• 2TFE) is protonated by 2,2,2-trifluoroethanol (TFE) whereas 12−and 12−• TFE are not even though ΔH°acid(TFE) = 361.7 ± 2.5 kcal mol−1 (as given in the NIST website at http://webbook.nist.gov) and the B3LYP/6-31+G(d,p) proton affinities are 384.7 (12−), 377.6 (12−• TFE), and 362.7 (12−• 2TFE) kcal mol−1. That is, only the weakest base in this series, and the dianion with an equal number of solvent molecules and charged sites, undergoes proton transfer. In a FTMS instrument at lower pressures (∼10−8 Torr) inefficient proton abstraction is observed with the monosolvated dianion. This difference, and the observed reactivities of 12−, 12−• TFE and 12−• 2TFE are rationalized with the aid of computed potential energy surfaces. The chemical structures of these cluster ions were also probed via collision-induced dissociations, infrared photodissociation from 2700 to 3200 cm−1, and extensive calculations. All of the TFE species are found to be solvated dianions, but incipient proton transfer to afford electrostatically defying anion-anion clusters is noted in two cases. In proton transfer reactions, formation of the conjugate acid as a solvated ion lowers the energy of the system and reduces the Coulomb repulsion barrier facilitating the overall process.

Published
2017

31. Styrene energetics and characterization of its conjugate base: An example of isotopic labeling gone awry

Author

Lev G Lis, Alireza Fattahi, and Steven R. Kass

Subjects
010405 organic chemistry, Hydrogen bond, Substituent, 010402 general chemistry, Condensed Matter Physics, Photochemistry, 01 natural sciences, Bond-dissociation energy, 0104 chemical sciences, Styrene, Isotopic labeling, chemistry.chemical_compound, Deprotonation, chemistry, Computational chemistry, Electron affinity, Hydrogen–deuterium exchange, Physical and Theoretical Chemistry, Instrumentation, Spectroscopy
Abstract

The equilibrium acidity of styrene was measured (ΔH°acid(PhCH CH2) = 390.6 ± 0.5 kcal mol−1) and its deprotonation site was revised from the ortho position on the aromatic ring to the α-hydrogen atom based upon deuterium-labeling studies and extensive computations. Somewhat surprisingly, the nature of the anionic base plays a critical role in properly determining the ionization site and avoiding misleading results due to extraordinary hydrogen–deuterium exchange. Bracketing the electron affinity of α-styryl radical (PhC CH2, 23.1 ± 3.4 kcal mol−1) enabled the α-C H bond dissociation energy (100.1 ± 3.4 kcal mol−1) of styrene and the effect of a phenyl substituent at an sp2-hybridized carbon to be determined. These results were compared to B3LYP, M06-2X, G3 and G4 computations.

Published
2017

32. Latest Results on the Radiation Tolerance of Diamond Detectors

Author

Daniele Passeri, Jacopo Forneris, Federico Picollo, Monica Scaringella, Thomas Hofmann, Keida Kanxheri, J. Goldstein, M. Gastal, K. K. Gan, N. Wermes, Marco Truccato, Aidan Grummer, Denis Dauvergne, M. Bartosik, Raffaello D'Alessandro, Mara Bruzzi, Chris Hutton, John Perry Cumalat, M. Traeger, Wim De Boer, M. Dunser, Harris Kagan, R. Wallny, Andrej Gorišek, J. Moss, R. Mountain, Re Alessandro, A. Quadt, Fabian Hügging, Laurent Gallin-Martel, A. Scorzoni, Stefano Lagomarsino, Jean-Marie Brom, Ivan Lopez Paz, I. Mandic, Andreas Alexopoulos, M. Pomorski, B. Sopko, Bojan Hiti, M. Yamouni, C. Tuve, Stefan M Spanier, J. Grosse-Knetter, Christian Dorfer, S. Spagnolo, J. J. Velthuis, R. Kass, M. Goffe, M. Hoeferkamp, W. Trischuk, Moritz Guthoff, Vladimir Cindro, Arianna Morozzi, M. Menichelli, V. Sopko, Helge Christoph Beck, V. Bellini, J. Hosselet, V. Belyaev, D. Hits, Marko Mikuz, M.-L. Gallin-Martel, A. Golubev, Sally Seidel, V. Eremin, Christian Schmidt, D.S. Smith, S. Roe, Silvio Sciortino, Roberto Perrino, B. Stugu, B. Bentele, Jens Janssen, Paolo Olivero, Alessandro Lo Giudice, N. Venturi, Ana Lacoste, Justas Zalieckas, F. Rarbi, Marina Artuso, M. Zavrtanik, Lukas Baeni, C. M. Sutera, S. Kuleshov, C. Mathieu, J. Collot, Diego Alejandro Sanz Becerra, M. Kis, Michael Philipp Reichmann, Enrico Junior Schioppa, G. Chiodini, G. Forcolin, A. Bes, D. Chren, L. Servoli, S. Wagner, C. Maazouzi, Eric Lukosi, E. Grigoriev, Oh Alexander, Jing Wang, H. Pernegger, Robert Stone, A. Dabrowski, G. Eigen, F. Bachmair, Kevin Stenson, S. Schnetzer, G. Claus, R. Potenza, G. Kramberger, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Rd42, Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Baeni, Luka, Alexopoulos, Andrea, Artuso, Marina, Bachmair, Felix, Bartosik, Marcin Ryszard, Beck, Helge Christoph, Bellini, Vincenzo, Belyaev, Vladimir, Bentele, Benjamin, Bes, Alexandre, Brom, Jean-Marie, Bruzzi, Mara, Chiodini, Gabriele, Chren, Dominik, Cindro, Vladimir, Claus, Gille, Collot, Johann, Cumalat, John, Dabrowski, Anne, D'Alessandro, Raffaello, Dauvergne, Deni, De Boer, Wim, Dorfer, Christian, Dunser, Marc, Eigen, Gerald, Eremin, Vladimir, Forcolin, Giulio Tiziano, Forneris, Jacopo, Gallin-Martel, Laurent, Gallin-Martel, Marie-Laure, Gan, K. K., Gastal, Martin, Goffe, Mathieu, Goldstein, Joel, Golubev, Alexander, Gorišek, Andrej, Grigoriev, Eugene, Grosse-Knetter, Jörn, Grummer, Aidan, Guthoff, Moritz, Hiti, Bojan, Hits, Dmitry, Hoeferkamp, Martin Robert, Hofmann, Thoma, Hosselet, Jérôme, Hügging, Fabian, Hutton, Chri, Janssen, Jen, Kagan, Harri, Kanxheri, Keida, Kass, Richard, Kis, Mladen, Kramberger, Gregor, Kuleshov, Sergey, Lacoste, Ana, Lagomarsino, Stefano, Lo Giudice, Alessandro, Lopez Paz, Ivan, Lukosi, Eric, Maazouzi, Chaker, Mandić, Igor, Mathieu, Cédric, Menichelli, Mauro, Mikuz, Marko, Morozzi, Arianna, Moss, Joshua, Mountain, Raymond, Oh, Alexander, Olivero, Paolo, Passeri, Daniele, Pernegger, Heinz, Perrino, Roberto, Picollo, Federico, Pomorski, Michal, Potenza, Renato, Quadt, Arnulf, Rarbi, Fatah Ellah, Re, Alessandro, Reichmann, Michael Philipp, Roe, Shaun, Sanz Becerra, Diego Alejandro, Scaringella, Monica, Schmidt, Christian, Schnetzer, Stephen, Schioppa, Enrico Junior, Sciortino, Silvio, Scorzoni, Andrea, Seidel, Sally, Servoli, Leonello, Smith, Dale Shane, Sopko, Bruno, Sopko, Vit, Spagnolo, Stefania, Spanier, Stefan, Stenson, Kevin, Stone, Robert, Stugu, Bjarne, Sutera, Concetta Maria, Traeger, Michael, Trischuk, William, Truccato, Marco, Tuve, Cristina, Velthuis, Jaap, Venturi, Nicola, Wagner, Stephen, Wallny, Rainer, Wang, J. C., Wermes, Norbert, Yamouni, Mahfoud, Zalieckas, Justa, Zavrtanik, Marko, Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
radiation tolerance, diamond detectors, Materials science, Nuclear Theory, Diamond, Chemical vapor deposition, engineering.material, Radiation tolerance, n: irradiation, engineering, Radiation damage, Physics::Accelerator Physics, Neutron, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Atomic physics, Nuclear Experiment, solid-state counter: diamond, Diamond detector, performance, radiation: damage, p: irradiation
Abstract

International audience; We have measured the radiation tolerance of chemical vapor deposition (CVD) diamond against protons and neutrons. The relative radiation damage constant of 24 GeV protons, 800 MeV protons, 70 MeV protons, and fast reactor neutrons is presented. The results are used to combine the measured data into a universal damage curve for diamond material.

Published
2019

33. Ferrocene Acidity and C-H Bond Dissociation Energy via Experiment and Theory

Author

Brent Speetzen and Steven R. Kass

Subjects
C h bond, 010304 chemical physics, 010402 general chemistry, 01 natural sciences, Bond-dissociation energy, 0104 chemical sciences, chemistry.chemical_compound, symbols.namesake, Fourier transform, Ferrocene, chemistry, Electron affinity (data page), 0103 physical sciences, symbols, Physical chemistry, Physical and Theoretical Chemistry
Abstract

The gas-phase acidity of ferrocene (ΔH°acid(1) = 391.5 ± 1.3 kcal mol–1) and electron affinity of the ferrocenyl radical (EA(1r) = 1.74 ± 0.08 eV) were measured in a Fourier transform mass spectrom...

Published
2019

34. Results on radiation tolerance of diamond detectors

Author

S. Wagner, C. Maazouzi, Jing Wang, M.-L. Gallin-Martel, Fabian Hügging, M. Gastal, Dominique Tromson, R. Kass, M. Bartosik, D.S. Smith, I. Haughton, Philippe Bergonzo, A. Dabrowski, H. Pernegger, E. Grigoriev, M. Traeger, Bin Gui, John Perry Cumalat, Andrej Gorišek, Michael Reichmann, Denis Dauvergne, F. Bachmair, C. Tuve, L. Gallin-Martel, D. Chren, Lukas Bäni, M. Dunser, R. Wallny, Kevin Stenson, Robert Stone, S. Spagnolo, Silvio Sciortino, L. Servoli, Roberto Perrino, V. Sopko, Arianna Morozzi, Grant Riley, Paolo Olivero, G. Chiodini, Marina Artuso, A. Lo Giudice, C.J. Schmidt, S. Roe, M. Hoeferkamp, Ana Lacoste, A. C. Taylor, J. Y. Hostachy, J. Goldstein, D. Sanz, C. Giroletti, V. Bellini, R. Mountain, R. Potenza, Eric Lukosi, M. Goffe, Miha Muskinja, K. K. Gan, A. Quadt, B. Bentele, G. Forcolin, Stefano Lagomarsino, Gregor Kasieczka, Douglas Schaefer, Stefan M Spanier, Monica Scaringella, C. M. Sutera, Sally Seidel, M. Kis, V. Eremin, J. Moss, N. Wermes, J. Hosslet, G. Kramberger, Jens Weingarten, C. Weiss, W. De Boer, J. J. Velthuis, A. Bes, Florian Kassel, Bojan Hiti, S. Schnetzer, C. Hutton, A. Golubev, G. Claus, Benjamin Bordy Tannenwald, T. Hofmann, Mara Bruzzi, M. Mikuž, M. Yamouni, W. Trischuk, M. Pomorski, Thorsten Wengler, Vladimir Cindro, M. Menichelli, James Beacham, B. Sopko, Jens Janssen, J. Grosse-Knetter, M. Zavrtanik, C. Mathieu, S. Kuleshov, J. Collot, N. Venturi, Christian Dorfer, I. Mandic, Daniele Passeri, Alexander Oh, Andreas Alexopoulos, Alessandra Re, D. Hits, Moritz Guthoff, Harris Kagan, V. Belyaev, J.-M. Brom, Jacopo Forneris, Raffaello D'Alessandro, Federico Picollo, A. Scorzoni, Helge Christoph Beck, Keida Kanxheri, Aidan Grummer, Ettore Vittone, S. Murphy, European Organization for Nuclear Research (CERN), Syracuse University, Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Ohio State University [Columbus] (OSU), Georg-August-University = Georg-August-Universität Göttingen, Istituto Nazionale di Fisica Nucleare, Sezione di Catania (INFN), Università degli studi di Catania = University of Catania (Unict), The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], University of Colorado [Boulder], Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institute of Theoretical and Experimental Physics [Moscow] (ITEP), National Research Center 'Kurchatov Institute' (NRC KI), Istituto Nazionale di Fisica Nucleare, Sezione di Firenze (INFN, Sezione di Firenze), Istituto Nazionale di Fisica Nucleare (INFN), Istituto Nazionale di Fisica Nucleare, Sezione di Lecce (INFN, Sezione di Lecce), Czech Technical University in Prague (CTU), Jozef Stefan Institute [Ljubljana] (IJS), Département Recherches Subatomiques (DRS-IPHC), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), University of Karlsruhe (TH), CERN [Genève], A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences [Moscow] (RAS), University of Manchester [Manchester], Università degli studi di Torino = University of Turin (UNITO), University of Bristol [Bristol], The University of New Mexico [Albuquerque], Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universität Bonn = University of Bonn, Rheinische Friedrich-Wilhelms-Universität Bonn, Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (INFN, Sezione di Perugia), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), The University of Tennessee [Knoxville], California State University [Sacramento], Laboratoire Capteurs Diamant (LCD-LIST), Département Métrologie Instrumentation & Information (DM2I), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Rutgers, The State University of New Jersey [New Brunswick] (RU), Rutgers University System (Rutgers), Tennessee State University, New Mexico State University, Gesellschaft für Schwerionenforschung mbH (MBH), Gesellschaft für Schwerionenforschung mbH, University of Toronto, Swiss National Science Foundation grant #20 FL20 _ 154216ETH grant 51 15-1 (Switzerland)Royal Society Grant UF120106 (United Kingdom)U.S. Department of Energy grant DE-SC0010061, European Project: 654168,H2020,H2020-INFRAIA-2014-2015,AIDA-2020(2015), University of Göttingen - Georg-August-Universität Göttingen, Università degli studi di Catania [Catania], Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Università degli studi di Torino (UNITO), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), University of Bonn, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST)

Subjects
Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Diamond detectors, Solid state detectors, Radiation hard detectors, 02 engineering and technology, Chemical vapor deposition, Radiation, engineering.material, 01 natural sciences, Radiation hard detectors, Nuclear physics, Radiation damage, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Solid state detectors, Diamond detectors, Instrumentation, Physics, Luminosity (scattering theory), Large Hadron Collider, 010401 analytical chemistry, Diamond, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Semiconductor detector, Upgrade, engineering, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Physics::Accelerator Physics, High Energy Physics::Experiment, 0210 nano-technology
Abstract

International audience; In sight of the luminosity increase of the High Luminosity-LHC (HL-LHC), most experiments at the CERN Large Hadron Collider (LHC) are planning upgrades for their innermost layers in the next 5–10 years. These upgrades will require more radiation tolerant technologies than exist today. Usage of Chemical Vapor Deposition (CVD) diamond as detector material is one of the potentially interesting technologies for the upgrade. CVD diamond has been used extensively in the beam condition monitors of BaBar, Belle, CDF and all LHC experiments. Measurements of the radiation tolerance of the highest quality polycrystalline CVD material for a range of proton energies, pions and neutrons obtained with this material are presented. In addition, new results on the evolution of various semiconductor parameters as a function of the dose rate are described.

Published
2019

35. A study of the radiation tolerance of poly-crystalline and single-crystalline CVD diamond to 800 MeV and 24 GeV protons

Author

Jacopo Forneris, Federico Picollo, Aidan Grummer, Harris Kagan, Dmitry Hits, D. Schaffner, Lukas Bäni, Fabian Hügging, V. Sopko, Robert Stone, M. Goffe, Arnulf Quadt, V. K. Eremin, Norbert Wermes, M. Gastal, V. Belyaev, Marina Artuso, R. Kass, R. Perrino, Joern Grosse-Knetter, Felix Bachmair, Denis Dauvergne, Sally Seidel, Gabriele Chiodini, S. Dick, K. K. Gan, W. Trischuk, Jing Wang, Stefano Lagomarsino, V. Bellini, Monica Scaringella, Bojan Hiti, Rainer Wallny, D. A. Sanz Becerra, Arianna Morozzi, M. Piccini, C. Weiss, D. Chren, J.-M. Brom, Raffaello D'Alessandro, A. Lo Giudice, A. Bes, Kevin Stenson, M. Zavrtanik, Cristina Tuve, I. Lopez Paz, Marc Dünser, Johann Collot, Giulio Tiziano Forcolin, Helge Christoph Beck, C.J. Schmidt, Nicola Venturi, Stephen Robert Wagner, Jens Janssen, Jens Weingarten, F. Rarbi, Stefania Spagnolo, Shaun Roe, W. De Boer, Michal Pomorski, Martin Hoeferkamp, J. J. Velthuis, L. Gallin-Martel, Renato Potenza, Gregor Kramberger, Andrea Scorzoni, A. A. Golubev, C. Hutton, Michael Reichmann, C. Giroletti, C. M. Sutera, Joel Goldstein, M. Kis, T. Hofmann, M. Traeger, Bin Gui, Marco Truccato, E. Grigoriev, Silvio Sciortino, J. Hosselet, C. Maazouzi, M. Bartosik, Igor Mandić, R. Mountain, S. M. Spanier, Ana Lacoste, L. Servoli, John Perry Cumalat, B. Sopko, D.S. Smith, Moritz Guthoff, Mauro Menichelli, B. Bentele, M. Yamouni, Gilles Claus, Paolo Olivero, Mara Bruzzi, Eric Lukosi, Josh Moss, C. Mathieu, Sergey Kuleshov, M.L. Gallin-Martel, K. Kanxheri, Anne Dabrowski, Andreas Alexopoulos, Gregor Kasieczka, Steve Schnetzer, M. Mikuž, Andrej Gorišek, Thorsten Wengler, Vladimir Cindro, J-Y. Hostachy, Heinz Pernegger, Alexander Oh, E. Schioppa, Christian Dorfer, Daniele Passeri, Alessandra Re, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Bäni, L., Alexopoulos, A., Artuso, M., Bachmair, F., Bartosik, M., Beck, H., Bellini, V., Belyaev, V., Bentele, B., Bes, A., Brom, J. -M., Bruzzi, M., Chiodini, G., Chren, D., Cindro, V., Claus, G., Collot, J., Cumalat, J., Dabrowski, A., D'Alessandro, R., Dauvergne, de Boer, W., Dick, S., Dorfer, C., Dünser, M., Eremin, V., Forcolin, G., Forneris, J., Gallin-Martel, L., Gallin-Martel, M. -L., Gan, K. K., Gastal, M., Giroletti, C., Goffe, M., Goldstein, J., Golubev, A., Gorišek, A., Grigoriev, E., Grosse-Knetter, J., Grummer, A., Gui, B., Guthoff, M., Hiti, B., Hits, D., Hoeferkamp, M., Hofmann, T., Hosselet, J., Hostachy, J. -Y., Hügging, F., Hutton, C., Janssen, J., Kagan, H., Kanxheri, K., Kasieczka, G., Kass, R., Kis, M., Kramberger, G., Kuleshov, S., Lacoste, A., Lagomarsino, S., Lo Giudice, A., Paz, I. Lopez, Lukosi, E., Maazouzi, C., Mandic, I., Mathieu, C., Menichelli, M., Mikuž, M., Morozzi, A., Moss, J., Mountain, R., Oh, A., Olivero, P., Passeri, D., Pernegger, H., Perrino, R., Piccini, M., Picollo, F., Pomorski, M., Potenza, R., Quadt, A., Rarbi, F., Re, A., Reichmann, M., Roe, S., Becerra, D. A. Sanz, Scaringella, M., Schaffner, D., Schmidt, C. J., Schnetzer, S., Schioppa, E., Sciortino, S., Scorzoni, A., Seidel, S., Servoli, L., Smith, D. S., Sopko, B., Sopko, V., Spagnolo, S., Spanier, S., Stenson, K., Stone, R., Sutera, C., Traeger, M., Trischuk, W., Truccato, M., Tuve, C., Velthuis, J., Venturi, N., Wagner, S., Wallny, R., Wang, J. C., Weingarten, J., Weiss, C., Wengler, T., Wermes, N., Yamouni, M., and Zavrtanik, M.

Subjects
charge collection distance, chemical vapor deposition, mean drift path, polycrystalline diamond, radiation damage constant, radiation tolerance, single crystal diamond, Technology, congenital, hereditary, and neonatal diseases and abnormalities, Materials science, Acoustics and Ultrasonics, Proton, Physics::Instrumentation and Detectors, Physics::Medical Physics, 02 engineering and technology, Electron, Chemical vapor deposition, engineering.material, 01 natural sciences, Fluence, Condensed Matter::Materials Science, hemic and lymphatic diseases, 0103 physical sciences, parasitic diseases, ddc:530, Irradiation, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, 010306 general physics, Nuclear Experiment, Diamond, 021001 nanoscience & nanotechnology, Condensed Matter Physics, eye diseases, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Full width at half maximum, engineering, sense organs, Atomic physics, 0210 nano-technology, ddc:600, Energy (signal processing)
Abstract

Journal of physics / D Applied physics D 52(46), 465103 (2019). doi:10.1088/1361-6463/ab37c6, Published by IOP Publ., Bristol

Published
2019

37. Study of the reactions e+e−→π+π−π0π0π0 and π+π−π0π0η at center-of-mass energies from threshold to 4.35 GeV using initial-state radiation

Author

J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, T. Schroeder, R. Cheaib, C. Hearty, T. S. Mattison, J. A. McKenna, R. Y. So, V. E. Blinov, A. R. Buzykaev, V. P. Druzhinin, V. B. Golubev, E. A. Kozyrev, E. A. Kravchenko, A. P. Onuchin, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, K. Yu. Todyshev, A. J. Lankford, B. Dey, J. W. Gary, O. Long, A. M. Eisner, W. S. Lockman, W. Panduro Vazquez, D. S. Chao, C. H. Cheng, B. Echenard, K. T. Flood, D. G. Hitlin, J. Kim, Y. Li, D. X. Lin, S. Middleton, T. S. Miyashita, P. Ongmongkolkul, J. Oyang, F. C. Porter, M. Röhrken, Z. Huard, B. T. Meadows, B. G. Pushpawela, M. D. Sokoloff, L. Sun, J. G. Smith, S. R. Wagner, D. Bernard, M. Verderi, D. Bettoni, C. Bozzi, R. Calabrese, G. Cibinetto, E. Fioravanti, I. Garzia, E. Luppi, V. Santoro, A. Calcaterra, R. de Sangro, G. Finocchiaro, S. Martellotti, P. Patteri, I. M. Peruzzi, M. Piccolo, M. Rotondo, A. Zallo, S. Passaggio, C. Patrignani, B. J. Shuve, H. M. Lacker, B. Bhuyan, U. Mallik, C. Chen, J. Cochran, S. Prell, A. V. Gritsan, N. Arnaud, M. Davier, F. Le Diberder, A. M. Lutz, G. Wormser, D. J. Lange, D. M. Wright, J. P. Coleman, E. Gabathuler, D. E. Hutchcroft, D. J. Payne, C. Touramanis, A. J. Bevan, F. Di Lodovico, R. Sacco, G. Cowan, Sw. Banerjee, C. L. Davis, A. G. Denig, W. Gradl, K. Griessinger, A. Hafner, K. R. Schubert, R. J. Barlow, G. D. Lafferty, R. Cenci, A. Jawahery, D. A. Roberts, R. Cowan, S. H. Robertson, R. M. Seddon, N. Neri, F. Palombo, L. Cremaldi, R. Godang, D. J. Summers, P. Taras, G. De Nardo, C. Sciacca, G. Raven, C. P. Jessop, J. M. LoSecco, K. Honscheid, R. Kass, A. Gaz, M. Margoni, M. Posocco, G. Simi, F. Simonetto, R. Stroili, S. Akar, E. Ben-Haim, M. Bomben, G. R. Bonneaud, G. Calderini, J. Chauveau, G. Marchiori, J. Ocariz, M. Biasini, E. Manoni, A. Rossi, G. Batignani, S. Bettarini, M. Carpinelli, G. Casarosa, M. Chrzaszcz, F. Forti, M. A. Giorgi, A. Lusiani, B. Oberhof, E. Paoloni, M. Rama, G. Rizzo, J. J. Walsh, L. Zani, A. J. S. Smith, F. Anulli, R. Faccini, F. Ferrarotto, F. Ferroni, A. Pilloni, G. Piredda, C. Bünger, S. Dittrich, O. Grünberg, M. Heß, T. Leddig, C. Voß, R. Waldi, T. Adye, F. F. Wilson, S. Emery, G. Vasseur, D. Aston, C. Cartaro, M. R. Convery, J. Dorfan, W. Dunwoodie, M. Ebert, R. C. Field, B. G. Fulsom, M. T. Graham, C. Hast, W. R. Innes, P. Kim, D. W. G. S. Leith, S. Luitz, D. B. MacFarlane, D. R. Muller, H. Neal, B. N. Ratcliff, A. Roodman, M. K. Sullivan, J. Va’vra, W. J. Wisniewski, M. V. Purohit, J. R. Wilson, A. Randle-Conde, S. J. Sekula, H. Ahmed, N. Tasneem, M. Bellis, P. R. Burchat, E. M. T. Puccio, M. S. Alam, J. A. Ernst, R. Gorodeisky, N. Guttman, D. R. Peimer, A. Soffer, S. M. Spanier, J. L. Ritchie, R. F. Schwitters, J. M. Izen, X. C. Lou, F. Bianchi, F. De Mori, A. Filippi, D. Gamba, L. Lanceri, L. Vitale, F. Martinez-Vidal, A. Oyanguren, J. Albert, A. Beaulieu, F. U. Bernlochner, G. J. King, R. Kowalewski, T. Lueck, C. Miller, I. M. Nugent, J. M. Roney, R. J. Sobie, T. J. Gershon, P. F. Harrison, T. E. Latham, R. Prepost, and S. L. Wu

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Hadron, 7. Clean energy, 01 natural sciences, Omega, 0103 physical sciences, Mass spectrum, Pi, Intermediate state, Invariant mass, 010306 general physics
Abstract

We study the processes $e^+e^-\to 2(\pi^+\pi^-)\pi^0\pi^0\pi^0\gamma$ and $2(\pi^+\pi^-)\pi^0\pi^0\eta\gamma$ in which an energetic photon is radiated from the initial state. The data were collected with the \babar~ detector at SLAC. About 14\,000 and 4700 events, respectively, are selected from a data sample corresponding to an integrated luminosity of 469 fb^{-1}. The invariant mass of the hadronic final state defines the effective \epem center-of-mass energy. The center-of-mass energies range from threshold to 4.5 GeV. From the mass spectra, the first ever measurements of the $e^+e^-\to 2(\pi^+\pi^-)\pi^0\pi^0\pi^0$ and the $e^+e^-\to2(\pi^+\pi^-)\pi^0\pi^0\eta$ cross sections are performed. The contributions from $\omega\pi^+\pi^-\pi^0\pi^0$, $\eta2(\pi^+\pi^-)$, and other intermediate states are presented. We observe the $J/\psi$ and $\psi(2S)$ in most of these final states and measure the corresponding branching fractions, many of them for the first time.

Published
2018

38. First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity

Author

V. B. Golubev, K. Chilikin, L. Zani, J. R. Wilson, Iki Adachi, T. S. Miyashita, Doo Young Kim, A. Palano, S. Emery, M. Feindt, J. B. Kim, K. Griessinger, D. Epifanov, A. Hafner, W. R. Innes, David Hutchcroft, O. Long, R. Cenci, Brian Meadows, J. M. Izen, M. Bellis, Eleonora Guido, H. Neal, K. Inami, H. Ye, R. Kass, S. Martellotti, D. W G S Leith, G. Schnell, E. Won, R. Pestotnik, S. Nishida, A. Calcaterra, J. P. Coleman, J. A. McKenna, T. E. Browder, J. Ocariz, M. T. Graham, F. Ferroni, R. J. Sobie, A. Roodman, S. Pardi, J. L. Ritchie, Noritaka Shimizu, Vikas Bansal, Eleonora Luppi, A. Beaulieu, Tara Nanut, T. Uglov, A. V. Gritsan, G. Wormser, A. G. Denig, Vitaly Vorobyev, B. N. Ratcliff, R. Y. So, T. Kuhr, S. R. Wagner, G. De Nardo, H. M. Lacker, M. Starič, D. Liventsev, E. Nakano, Z. Drásal, V. Savinov, D. J. Summers, C. H. Cheng, H. Ono, D. A. Roberts, S. Al Said, T. Matsuda, A. J S Smith, D. S. Chao, Vladimir Zhulanov, R. Kroeger, E. Ben-Haim, M. E. Sevior, I. S. Lee, S. J. Sekula, C. Bozzi, R. Mizuk, M. Piccolo, F. Di Lodovico, S. Uno, R. Kulasiri, T. Schroeder, A. J. Lankford, S. Sandilya, R. Godang, P. Goldenzweig, P. Pakhlov, N. Tasneem, J. Albert, G.V. Russo, J. Cochran, Yu. G. Kolomensky, H. Hayashii, J. Libby, C. Van Hulse, T. A. Shibata, Z. C. Huard, U. Tamponi, S. Passaggio, H. Miyata, B. Pal, Y. B. Li, Marcin Chrzaszcz, F. Le Diberder, Michael Sokoloff, Ray Franklin Cowan, P. C. Kim, F. U. Bernlochner, P. Patteri, Prafulla Kumar Behera, W. S. Hou, I. M. Peruzzi, B. Oberhof, F. Simonetto, J. G. Shiu, G. J. King, V. Babu, K. T. Kim, J. K. Ahn, A. Soffer, M. Z. Wang, K. Kinoshita, B. Bhuyan, N. Guttman, H. Park, A. Bozek, S. H. Kim, J. Dorfan, M. Gelb, H. Koch, Vladimir Popov, A. Zallo, S. Jia, D. N. Brown, R. Stroili, R. Ayad, K. Cho, C. Hearty, M. Iwasaki, P. K. Resmi, Marcello Rotondo, B. G. Cheon, James E. Fast, A. Kuzmin, M. Ebert, T. K. Pedlar, T. Kumita, K. Yu. Todyshevx, F. Forti, Y. Choi, K. J. Nath, E. A. Kravchenko, L. Santelj, K. H. Kang, T. Leddig, Shih-Chang Lee, D. Matvienko, C. Voß, M. Bomben, J. Haba, Dominik Müller, X. C. Lou, C. Chen, G. Finocchiaro, C. Z. Yuan, Y. Jin, A. J. Schwartz, C. H. Wang, Alberto Lusiani, Semen Eidelman, E. Grauges, L. Vitale, S. Ogawa, A. Rossi, Y. Watanabe, J. P. Lees, A. Filippi, S. E. Vahsen, G. A. Cowan, C. Bünger, C. Sciacca, R. C. Field, Gabriele Simi, G. Eigen, R. Gorodeisky, F. Martinez-Vidal, J. J. Walsh, C. Schwanda, R. Itoh, H. Ahmed, D. Cinabro, Tao Luo, F. Tenchini, Th. Müller, G. Rizzo, Y. Sakai, D. Bernard, J. Chauveau, S. I. Serednyakov, F. Palombo, S. Korpar, E. Gabathuler, T. Ferber, Tagir Aushev, C. Cartaro, Y. Onuki, A. Jawahery, M. Nayak, G. Cibinetto, M. K. Sullivan, M. Margoni, Y. Guan, A. Oyanguren, E. Waheed, R. M. Seddon, Nicola Neri, J. W. Gary, V. Gaur, W. Panduro Vazquez, Y. Iwasaki, C. Touramanis, S. Luitz, K. R. Schubert, P. Taras, S. Hirose, D. J. Payne, E. Fioravanti, Y. Li, Y. J. Kwon, V.N. Zhilich, F. Ferrarotto, E. M. T. Puccio, G. B. Mohanty, P. L. Wang, B. Golob, T. Lueck, Roland Waldi, Biplab Dey, Peter Kodys, Fergus Wilson, M. A. Giorgi, E. Paoloni, A. Zupanc, F. De Mori, A. B. Kaliyar, P. F. Harrison, H. Kichimi, D. G. Hitlin, H. K. Moon, M. R. Convery, A. Chen, F. Bianchi, G. Piredda, O. Schneider, U. Mallik, R. Cheaib, Y. Yusa, Bingran Wang, M. Röhrken, K. Senyo, J. S. Lange, V. Santoro, W. J. Wisniewski, C. Hast, W. W. Jacobs, A. M. Eisner, I. M. Nugent, M. T. Hedges, M. Carpinelli, K. Miyabayashi, I. Badhrees, M. Posocco, B. G. Fulsom, R. F. Schwitters, G. Varner, R. Mussa, A. M. Lutz, K. T. Flood, G. Casarosa, Simon Akar, M. Takizawa, Pavel Krokovny, R. Calabrese, V. E. Blinov, A. R. Buzykaev, A. Ishikawa, G. Vasseur, Roger Barlow, Ju-Young Kim, Miriam Heß, Y. Seino, S. Bettarini, R. de Sangro, M. Nakao, M. Biasini, P. Križan, G. Raven, Alexander Bondar, D. Gamba, R. Sacco, L. Cremaldi, Yu. I. Skovpen, C. P. Shen, K. Honscheid, G. Calderini, Elisa Manoni, R. Kowalewski, N. Arnaud, V.E. Shebalin, M. Heck, L. K. Li, M. V. Purohit, S. Di Carlo, D. M. Asner, K. Hayasaka, Sw. Banerjee, Soumen Paul, M. Uchida, G. Pakhlova, P. R. Burchat, G. Karyan, V. Bhardwaj, C. L. Hsu, J. A. Ernst, S. L. Wu, P. Ongmongkolkul, H. Atmacan, D. B. Macfarlane, Alessandro Pilloni, K. K. Joo, S. Dittrich, D. R. Peimer, Kiyoshi Tanida, Timothy Gershon, D. Aston, L. Li Gioi, A. Garmash, F. Anulli, Z. Doležal, J. M. Roney, Yoshinobu Unno, S. Zakharov, M. Lubej, G. Inguglia, V. Zhukova, M. Merola, A. K. Giri, K. Sumisawa, S. M. Spanier, G. Batignani, M. Masuda, C. L. Davis, M. Fritsch, A. P. Onuchin, L. Sun, Adrian John Bevan, Somnath Choudhury, Leo Piilonen, O. Seon, Frank Simon, D. J. Lange, Matteo Rama, James G. Smith, V. P. Druzhinin, D. M. Wright, M. S. Alam, E. Solovieva, R. Prepost, N. Dash, M. Rozanska, D. Kotchetkov, T. Adye, A. Randle-Conde, T. Julius, M. Verderi, R. Faccini, V. Poireau, T. Sumiyoshi, J. M. Losecco, G. Marchiori, F. C. Porter, Martin Ritter, T. Sanuki, S. Cunliffe, J. Va'Vra, W. S. Lockman, M. Salehi, H. Aihara, George Lafferty, C. P. Jessop, T. Hara, T. Mori, Oliver Grünberg, G. R. Bonneaud, N. K. Nisar, I. Pavelkin, D. Bettoni, Z. P. Zhang, S. Prell, B. G. Pushpawela, A. Gaz, S. H. Robertson, L. Lanceri, Jyoti Prakash Biswal, B. Echenard, M. Davier, J. MacNaughton, A. M. Bakich, W. Dunwoodie, D. Červenkov, Rocky Bala Garg, T. S. Mattison, W. Gradl, E. P. Solodov, I. Garzia, Thomas Latham, C. Patrignani, V. Tisserand, and M. Bračko

Subjects
Quark, Physics, Particle physics, Unitarity, 010308 nuclear & particles physics, Electron–positron annihilation, Hadron, General Physics and Astronomy, Dalitz plot, 01 natural sciences, B-factory, KEKB, 0103 physical sciences, CP violation, 010306 general physics
Abstract

We present first evidence that the cosine of the CP-violating weak phase 2β is positive, and hence exclude trigonometric multifold solutions of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle using a time-dependent Dalitz plot analysis of B^{0}→D^{(*)}h^{0} with D→K_{S}^{0}π^{+}π^{-} decays, where h^{0}∈{π^{0},η,ω} denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BABAR and Belle experiments collected at the ϒ(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×10^{6}BB[over ¯] pairs recorded by the BABAR detector and (772±11)×10^{6}BB[over ¯] pairs recorded by the Belle detector. The results of the measurement are sin2β=0.80±0.14(stat)±0.06(syst)±0.03(model) and cos2β=0.91±0.22(stat)±0.09(syst)±0.07(model). The result for the direct measurement of the angle β of the CKM Unitarity Triangle is β=[22.5±4.4(stat)±1.2(syst)±0.6(model)]°. The measurement assumes no direct CP violation in B^{0}→D^{(*)}h^{0} decays. The quoted model uncertainties are due to the composition of the D^{0}→K_{S}^{0}π^{+}π^{-} decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics e^{+}e^{-}→cc[over ¯] data sample. CP violation is observed in B^{0}→D^{(*)}h^{0} decays at the level of 5.1 standard deviations. The significance for cos2β>0 is 3.7 standard deviations. The trigonometric multifold solution π/2-β=(68.1±0.7)° is excluded at the level of 7.3 standard deviations. The measurement resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle.

Published
2018

39. Measurement of the γ*γ*→η′ transition form factor

Author

A. J S Smith, A. Randle-Conde, R. F. Schwitters, R. Cenci, R. de Sangro, M. K. Sullivan, Z. C. Huard, Gabriele Simi, J. R. Wilson, T. S. Miyashita, F. Le Diberder, C. H. Cheng, K. Yu Todyshev, V. E. Blinov, Marcin Chrzaszcz, M. Verderi, Eleonora Luppi, Yu. I. Skovpen, G. J. King, M. A. Giorgi, S. Passaggio, R. Faccini, J. M. Izen, Simon Akar, M. Bellis, T. Leddig, K. Honscheid, F. Forti, A. R. Buzykaev, C. Cartaro, D. J. Summers, A. M. Lutz, M. V. Purohit, F. Bianchi, J. W. Gary, P. Taras, A. Calcaterra, I. M. Nugent, R. Kowalewski, J. Dorfan, D. Gamba, D. J. Payne, X. C. Lou, N. Arnaud, J. P. Coleman, G. Eigen, M. Margoni, A. Soffer, R. Godang, E. Paoloni, M. Heß, D. S. Chao, G. Wormser, G. Batignani, M. R. Convery, D. B. Macfarlane, L. Lanceri, R. J. Sobie, A. Roodman, D. J. Lange, Alessandro Pilloni, D. R. Peimer, T. Schroeder, A. J. Lankford, D. Aston, W. Panduro Vazquez, Wu S. L., R. M. Seddon, E. P. Solodov, J. Chauveau, M. Posocco, S. Bettarini, R. Prepost, Y. B. Li, G. Piredda, F. Anulli, U. Mallik, M. Carpinelli, J. Va'Vra, E. Fioravanti, W. S. Lockman, Roland Waldi, So R. Y., L. Vitale, K. T. Flood, Ray Franklin Cowan, C. Chen, G. Raven, L. Zani, G. Vasseur, M. Piccolo, P. C. Kim, F. U. Bernlochner, T. Adye, J. M. Roney, S. M. Spanier, C. L. Davis, B. Echenard, M. Fritsch, K. Griessinger, G. Calderini, Alberto Lusiani, J. Ocariz, G. Casarosa, C. Hearty, Marcello Rotondo, S. Emery, M. T. Graham, B. Bhuyan, F. Simonetto, Timothy Gershon, R. Cheaib, Ju-Young Kim, M. Davier, A. Oyanguren, M. Bomben, Dominik Müller, F. Ferroni, Biplab Dey, W. J. Wisniewski, D. A. Roberts, F. Di Lodovico, Brian Meadows, E. Grauges, F. Martinez-Vidal, J. J. Walsh, Matteo Rama, A. V. Gritsan, D. Bernard, Fergus Wilson, A. G. Denig, B. N. Ratcliff, I. Garzia, James G. Smith, C. Sciacca, R. C. Field, H. Ahmed, C. Touramanis, D. N. Brown, S. Luitz, K. R. Schubert, S. I. Serednyakov, F. Palombo, V. Poireau, Thomas Latham, C. Patrignani, V. Tisserand, J. L. Ritchie, R. Calabrese, Nicola Neri, M. Biasini, T. Lueck, F. De Mori, J. M. Losecco, G. Marchiori, D. G. Hitlin, Elisa Manoni, F. C. Porter, Michael Sokoloff, J. Cochran, C. Bozzi, R. Gorodeisky, C. Hast, P. R. Burchat, G. A. Cowan, A. P. Onuchin, L. Sun, Sw. Banerjee, Yu. G. Kolomensky, P. Ongmongkolkul, E. Ben-Haim, J. A. Ernst, N. Tasneem, J. Albert, T. S. Mattison, N. Guttman, B. G. Fulsom, W. Gradl, Adrian John Bevan, F. Ferrarotto, E. M. T. Puccio, S. Dittrich, I. M. Peruzzi, M. Ebert, R. Stroili, A. Rossi, O. Long, C. Bünger, S. Martellotti, V. P. Druzhinin, D. M. Wright, G. De Nardo, H. M. Lacker, A. Jawahery, S. J. Sekula, G. Cibinetto, P. Patteri, W. Dunwoodie, M. S. Alam, H. Koch, E. A. Kozyrev, G. Finocchiaro, H. Neal, R. Kass, D. W G S Leith, A. Beaulieu, D. Bettoni, S. Prell, V. B. Golubev, B. G. Pushpawela, M. Röhrken, A. Gaz, R. Sacco, B. Oberhof, S. H. Robertson, A. Palano, E. A. Kravchenko, George Lafferty, C. P. Jessop, A. Filippi, G. Rizzo, A. Hafner, W. R. Innes, David Hutchcroft, Oliver Grünberg, G. R. Bonneaud, A. Zallo, C. Voß, J. A. McKenna, S. R. Wagner, E. Gabathuler, P. F. Harrison, A. M. Eisner, Roger Barlow, J. P. Lees, V. Santoro, and L. Cremaldi

Subjects
Physics, Range (particle radiation), 010308 nuclear & particles physics, Electron–positron annihilation, Form factor (quantum field theory), 01 natural sciences, 7. Clean energy, Measure (mathematics), law.invention, Luminosity, Nuclear physics, law, 0103 physical sciences, 010306 general physics, Collider
Abstract

We study the process e^+e^− → e^+e^−η′ in the double-tag mode and measure for the first time the γ⋆γ⋆ → η′ transition form factor F_η′(Q^2_1,Q^2_2) in the momentum-transfer range 2 < Q^2_1, Q^2_2 < 60 GeV^2. The analysis is based on a data sample corresponding to an integrated luminosity of around 469 fb^(-1) collected at the PEP-II e^+e^− collider with the BABAR detector at center-of-mass energies near 10.6 GeV.

Published
2018

40. The feed value and amino acid composition of sprouted triticale grains

Author

R. Kassymbek

Subjects
triticale, germination, variety, compound feed, feed value, crude protein, fiber, digestibility, Technology (General), T1-995
Abstract

The research is devoted to the feed value and amino acid composition of sprouted triticale grain. The purpose of the study is to study the feed value of sprouted triticale grain. The article presents the results of a study of 3 domestic varieties of sprouted triticale grains for use in the feed industry. The physicochemical parameters, as well as the mass fraction of carbohydrates, the content of vitamins, mineral elements and the amino acid composition of sprouted triticale grains were studied. The data obtained indicate that the use of sprouted triticale grains is a source of easily digestible carbohydrates, amino acids, fatty acids, vitamins and enzymes. According to the content of crude protein, the leading grade of Taza was 15.83%, according to the content of crude fiber, the grade of Kozhar was 13.77%. The content of the mineral elements potassium and phosphorus is highest in the Asiada variety potassium- 422.18% and phosphorus-340.07%. The use of sprouted grain in the feed industry to increase the digestibility and digestibility of animal feed. The practical significance of the technology for the production of compound feeds using sprouted triticale grain in order to improve quality and increase shelf life.

Published
2023
Full Text
View/download PDF

41. Electrostatically Enhanced Phosphoric Acids: A Tool in Brønsted Acid Catalysis

Author

Jie Ma and Steven R. Kass

Subjects
Chemical substance, 010405 organic chemistry, Orders of magnitude (temperature), Organic Chemistry, Nanotechnology, 010402 general chemistry, 01 natural sciences, Biochemistry, 0104 chemical sciences, law.invention, Catalysis, chemistry.chemical_compound, chemistry, Magazine, Polymerization, law, Polymer chemistry, Reactivity (chemistry), Physical and Theoretical Chemistry, Brønsted–Lowry acid–base theory, Phosphoric acid
Abstract

A novel type of phosphoric acid catalyst with enhanced reactivity is reported. These compounds possess one or two positively charged centers which electrostatically activate them. This is illustrated in several bond-forming transformations including Friedel-Crafts and Diels-Alder reactions as well as a ring-opening polymerization. Rate accelerations corresponding to orders of magnitude are observed.

Published
2016

42. A 3D diamond detector for particle tracking

Author

V. Sopko, Lars Graber, Martin Hoeferkamp, Arnulf Quadt, T. Hofmann, G. Parrini, Thorsten Wengler, R. Eusebi, Dominique Tromson, R. Kass, Vladimir Cindro, M. Menichelli, M. Pauluzzi, G. Chiodini, Dmitry Hits, J-Y. Hostachy, James Beacham, S. Kuleshov, Jing Wang, C. Tuve, Lorenzo Uplegger, G. Riley, Jens Janssen, H. Frais-Kölbl, R. Perrino, M. Kis, Bernd Dehning, Joel Goldstein, Anna Sfyrla, Andrea Scorzoni, Marc Dünser, Andrej Gorišek, Lukas Bäni, J. Hosslet, G. Shimchuk, Felix Bachmair, Fabian Hügging, R. Wallny, Daniel Dobos, V. K. Eremin, M. Zavrtanik, Mariusz Sapinski, Johann Collot, Silvio Sciortino, B. Sopko, Josh Moss, C. Mathieu, D.S. Smith, Arianna Morozzi, G. McGoldrick, Heinz Pernegger, Alexander Oh, E. Berdermann, A. Lo Giudice, B. Gui, E. Grigoriev, Robert Stone, T. Schreiner, G. Forcolin, Sally Seidel, Jacopo Forneris, Federico Picollo, W. De Boer, A. Bes, K. K. Gan, Paolo Olivero, Kevin Stenson, Leonello Servoli, K. Kanxheri, Gregor Kasieczka, V. Belyaev, C. Maazouzi, D. Chren, Jens Weingarten, C. Weiss, Nicola Venturi, Anne Dabrowski, H. Jansen, N. C. McFadden, V. Bellini, Joern Grosse-Knetter, Harris Kagan, Stefania Spagnolo, Alessandra Re, A. C. Taylor, M. Bartosik, Stephen Robert Wagner, C. Sutera, John Perry Cumalat, Michal Pomorski, Steve Schnetzer, Stéphane Costa, Gregor Kramberger, R. D׳alessandro, Laura Gonella, Matevz Cerv, R. Potenza, Ettore Vittone, B. Bentele, S. Murphy, Shaun Roe, Chav Chhiv Chau, William Trischuk, Stefano Lagomarsino, I. Haughton, Philippe Bergonzo, Jean-Marie Brom, Ana Lacoste, M. Yamouni, Stefan M Spanier, Gilles Claus, M. Traeger, Igor Mandić, A. A. Golubev, M. Gastal, Daniele Passeri, R. Mountain, P. Weilhammer, M. Scaringella, Moritz Guthoff, Dean Hidas, Jaap Velthuis, M. Goffe, Norbert Wermes, Marina Artuso, Mara Bruzzi, Marko Mikuž, Florian Kassel, Syracuse University, Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), European Organization for Nuclear Research (CERN), Ohio State University [Columbus] (OSU), Istituto Nazionale di Fisica Nucleare, Sezione di Catania (INFN), Università degli studi di Catania [Catania], The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], University of Colorado [Boulder], Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Laboratoire Capteurs Diamant (LCD-LIST), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Fisica Nucleare, Sezione di Firenze (INFN, Sezione di Firenze), Istituto Nazionale di Fisica Nucleare (INFN), University of Toronto, Istituto Nazionale di Fisica Nucleare, Sezione di Lecce (INFN, Sezione di Lecce), Czech Technical University in Prague (CTU), Jozef Stefan Institute [Ljubljana] (IJS), Universität Karlsruhe (TH), Institute for Particle Physics and Astrophysics [ETH Zürich] (IPA), Department of Physics [ETH Zürich] (D-PHYS), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences [Moscow] (RAS), Texas A&M International University [Laredo], University of Manchester [Manchester], Rutgers, The State University of New Jersey [New Brunswick] (RU), Rutgers University System (Rutgers), Fachhochschule Wiener Neustadt, University of Bristol [Bristol], Institute of Theoretical and Experimental Physics [Moscow] (ITEP), National Research Center 'Kurchatov Institute' (NRC KI), University of Bonn, Georg-August-University [Göttingen], The University of New Mexico [Albuquerque], Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (INFN, Sezione di Perugia), University of Karlsruhe (TH), Gesellschaft für Schwerionenforschung mbH (MBH), Gesellschaft für Schwerionenforschung mbH, Università degli studi di Torino (UNITO), Rutgers University [Camden], Laboratoire Capteurs et Architectures Electroniques (LCAE), Department of Anthropology [University of Toronto], Fermi National Accelerator Laboratory (Fermilab), Rheinische Friedrich-Wilhelms-Universität Bonn, Università degli studi di Catania = University of Catania (Unict), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universität Bonn = University of Bonn, Georg-August-University = Georg-August-Universität Göttingen, and Università degli studi di Torino = University of Turin (UNITO)

Subjects
Nuclear and High Energy Physics, CVD diamond, Solid state detectors, Tracking detectors, Instrumentation, Nanotechnology, 02 engineering and technology, Chemical vapor deposition, engineering.material, 010402 general chemistry, Tracking (particle physics), 01 natural sciences, Particle detector, law.invention, symbols.namesake, diamond, law, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, detector, particles, tracking, Physics, business.industry, Diamond, Tracking detectors, Solid State Detectors, CVD diamond, 021001 nanoscience & nanotechnology, Laser, 0104 chemical sciences, Electrode, Femtosecond, symbols, engineering, Optoelectronics, 0210 nano-technology, Raman spectroscopy, business
Abstract

Proceedings of the 13th Pisa Meeting on Advanced Detectors : Frontier Detectors for Frontier Physics, 24-30 May 2015, La Biodola, Italy.; International audience; In the present study, results towards the development of a 3D diamond sensor are presented. Conductive channels are produced inside the sensor bulk using a femtosecond laser. This electrode geometry allows full charge collection even for low quality diamond sensors. Results from testbeam show that charge is collected by these electrodes. In order to understand the channel growth parameters, with the goal of producing low resistivity channels, the conductive channels produced with a different laser setup are evaluated by Raman spectroscopy.

Published
2016

43. Flexible Acyclic Polyol-Chloride Anion Complexes and Their Characterization by Photoelectron Spectroscopy and Variable Temperature Binding Constant Determinations

Author

Yanping Wang, George A. O'Doherty, Xue-Bin Wang, Alireza Shokri, and Steven R. Kass

Subjects
Hydrogen, 010405 organic chemistry, Hydrogen bond, Analytical chemistry, chemistry.chemical_element, Ionic bonding, 010402 general chemistry, 01 natural sciences, Chloride, Bond-dissociation energy, 0104 chemical sciences, Ion, chemistry.chemical_compound, chemistry, X-ray photoelectron spectroscopy, medicine, Physical chemistry, Physical and Theoretical Chemistry, Methylene, medicine.drug
Abstract

Flexible acyclic alcohols with one to five hydroxyl groups were bound to a chloride anion and these complexes were interrogated by negative ion photoelectron spectroscopy and companion density functional theory computations. The resulting vertical detachment energies are reproduced on average to 0.10 eV by M06-2X/aug-cc-pVTZ predictions and range from 4.45-5.96 eV. These values are 0.84-2.35 eV larger than the adiabatic detachment energy of Cl(-) as a result of the larger hydrogen bond networks in the bigger polyols. Adiabatic detachment energies of the alcohol-Cl(-) clusters are more difficult to determine both experimentally and computationally. This is due to the large geometry changes that occur upon photodetachment and the large bond dissociation energy of H-Cl which enables the resulting chlorine atom to abstract a hydrogen from any of the methylene (CH2) or methine (CH) positions. Both ionic and nonionic hydrogen bonds (i.e., OH···Cl(-) and OH···OH···Cl(-)) form in the larger polyols complexes and are found to be energetically comparable. Subtle structural differences, consequently can lead to the formation of different types of hydrogen bonds, and maximizing the ionic ones is not always preferred. Solution equilibrium binding constants between the alcohols and tetrabutylammonium chloride (TBACl) in acetonitrile at -24.2, +22.0, and +53.6 °C were also determined. The free energies of association are nearly identical for all of the substrates (i.e., ΔG° = -2.8 ± 0.7 kcal mol(-1)). Compensating enthalpy and entropy values reveal, contrary to expectation and the intrinsic gas-phase preferences, that the bigger systems with more hydroxyl groups are entropically favored and enthalpically disfavored relative to the smaller species. This suggests that more solvent molecules are released upon binding TBACl to alcohols with more hydroxyl groups and is consistent with the measured negative heat capacities. These quantities increase with molecular complexity of the substrate, however, contrary to common interpretation of these values.

Published
2016

44. Occult myocardial injury is prevalent amongst elderly patients in the hospital-at-home setting. A retrospective analysis of 213 patients

Author

Y. Marziano, E. Abutbul, A. Sharabi, E. Grossbard, A. Berman, R. Kassif-Lerner, G. Barkai, H. Hakim, and G. Segal

Subjects
Myocardial injury, Hospital-at-home, Telemedicine, Troponin, Occult myocardial damage, Diseases of the circulatory (Cardiovascular) system, RC666-701
Abstract

Background: Hospital-at-Home (HAH) is a valid alternative for in-hospital stay for a wide variety of clinical indications. Occult myocardial injury, associated with acute illness, mainly occurs in patients with a background of non-obstructive coronary disease. The aim of this study was to describe the prevalence of this phenomenon in our HAH population. Methods: A retrospective description and analysis of data collected for patients admitted to the Sheba beyond's HAH services during 14 months. Results: During a period of 14 months (7/10/21–6/12/22), blood troponin measurements were available for 213 patients (median age 78 years, 52% males) hospitalized mainly for infectious causes. The median HS (highly sensitive) troponin level was 7.7 ng/L (IQR = 13.2 ng/L) (the normal upper limit is 12 ng/L) with 31% of all patients demonstrating an abnormally increased troponin level (68/213). Of all patients, 64% had a background diagnosis of a cardiovascular disease (138/213), of whom, 49% had abnormal HS troponin levels (68/138). No patient suffered from acute cardiac function deterioration and no patient died during their hospital-at-home stay. Conclusion: The prevalence of occult myocardial injury amongst elderly patients admitted to hospital-at-home stay for diagnoses other than myocardial infarction is relatively high but it is not associated with worse short-term clinical outcomes.

Published
2023
Full Text
View/download PDF

45. Use of dietary therapies amongst patients with GLUT1 deficiency syndrome

Author

Eric H. Kossoff, Stacey K. Bessone, S. Parrish Winesett, Hannah R. Kass, and Zahava Turner

Subjects
Male, 0301 basic medicine, Pediatrics, Ketogenic, medicine.medical_treatment, Diet, Carbohydrate-Restricted, chemistry.chemical_compound, Epilepsy, 0302 clinical medicine, Seizure control, Medium-chain triglyceride, Child, General Medicine, Treatment Outcome, Neurology, Child, Preschool, Female, Diet, Ketogenic, Carbohydrate Metabolism, Inborn Errors, medicine.medical_specialty, Deficiency syndrome, Adolescent, Monosaccharide Transport Proteins, food.diet, Clinical Neurology, 03 medical and health sciences, food, Seizures, Internal medicine, medicine, Humans, Family Health, Atkins diet, Triglyceride, business.industry, Infant, Ketosis, medicine.disease, Health Surveys, Diet, Glucose, 030104 developmental biology, Endocrinology, chemistry, Neurology (clinical), business, GLUT1, 030217 neurology & neurosurgery, Ketogenic diet
Abstract

Purpose GLUT-1 deficiency syndrome (GLUT1DS) is a neurologic disorder manifesting as epilepsy, abnormal movements, and cognitive delay. The currently accepted treatment of choice is the classic 4:1 ratio ketogenic diet. Methods A 2-page survey was distributed to all attendees of a family-centered conference for GLUT1DS in July 2015. The surveys were completed by parents, collected anonymously, and information analyzed in a database. Results Surveys were received from 92 families, of which 90 (98%) had been treated with dietary therapies. Diets used were extremely varied: 59 were treated with the classic ketogenic diet (KD), 29 with the Modified Atkins Diet (MAD), 4 with the Medium-chain Triglyceride (MCT) Diet and 2 with the low glycemic index treatment. The mean diet duration was 5.5 years (range: 1 month–20 years). Of those with seizures, 95% of the children had >50% seizure reduction and 80% had >90% seizure reduction. Children who were seizure-free were currently younger on average (8.2 vs. 11.6 years, p =0.01) and slightly younger at GLUT1DS diagnosis (3.8 vs. 5.3 years, p =0.05). There was an equal percentage of children seizure-free receiving the KD/MCT Diets compared to the MAD/Low Glycemic Index Treatment (74% vs. 63%, p =0.30). The majority (64%) were not receiving anticonvulsants. Conclusion This represents the largest series of KD experience in children with GLUT1DS. Nearly all patients surveyed were on dietary therapies for long durations with reported excellent seizure control, often without anticonvulsant drugs. Several different ketogenic diets were utilized with similar efficacy. Early diagnosis and treatment were correlated with success.

Published
2016
Full Text
View/download PDF

46. Measurement of the spectral function for the τ−→K−KSντ decay

Author

G. J. King, D. B. Macfarlane, B. Bhuyan, J. Dorfan, Z. C. Huard, J. M. Izen, E. Grauges, M. Bellis, F. Martinez-Vidal, J. J. Walsh, V. B. Golubev, M. Röhrken, George Lafferty, C. P. Jessop, V. E. Blinov, Matteo Rama, A. V. Gritsan, A. Palano, James G. Smith, H. Neal, R. Kass, P. Ongmongkolkul, A. Hafner, W. R. Innes, David Hutchcroft, D. W G S Leith, D. Gamba, A. Beaulieu, J. Va'Vra, Oliver Grünberg, G. R. Bonneaud, W. S. Lockman, L. Lanceri, J. A. McKenna, S. R. Wagner, A. Calcaterra, B. Echenard, C. H. Cheng, R. M. Seddon, E. Fioravanti, A. G. Denig, B. N. Ratcliff, C. Bünger, M. Davier, V. P. Druzhinin, Ray Franklin Cowan, S. M. Spanier, A. Oyanguren, K. Griessinger, C. L. Davis, R. F. Schwitters, A. J S Smith, P. C. Kim, M. Posocco, K. T. Flood, R. Cheaib, A. Jawahery, N. Guttman, R. Stroili, M. Fritsch, F. U. Bernlochner, G. Cibinetto, J. Ocariz, M. T. Graham, D. M. Wright, M. S. Alam, Brian Meadows, Roland Waldi, So R. Y., F. De Mori, J. P. Lees, E. A. Kozyrev, W. J. Wisniewski, F. Ferroni, R. Gorodeisky, G. Vasseur, G. Wormser, F. Le Diberder, K. Yu Todyshev, B. G. Fulsom, C. Bozzi, Gabriele Simi, J. P. Coleman, R. Cenci, Ju-Young Kim, M. Bomben, F. Forti, R. Sacco, M. Margoni, C. Voß, Marcin Chrzaszcz, B. Oberhof, J. Cochran, A. M. Lutz, A. Zallo, Dominik Müller, T. Schroeder, A. J. Lankford, Yu. G. Kolomensky, G. Piredda, V. Santoro, U. Mallik, G. Batignani, M. Biasini, D. N. Brown, Y. B. Li, Michael Sokoloff, F. Ferrarotto, E. M. T. Puccio, M. Carpinelli, R. Godang, C. Sciacca, R. C. Field, H. Ahmed, T. Leddig, E. A. Kravchenko, D. J. Lange, R. Prepost, G. Casarosa, M. Ebert, P. R. Burchat, J. A. Ernst, L. Zani, A. Rossi, G. A. Cowan, S. Emery, Eleonora Luppi, C. Hearty, Marcello Rotondo, T. Adye, L. Vitale, X. C. Lou, S. Dittrich, J. L. Ritchie, O. Long, Wu S. L., D. Bernard, G. Eigen, A. Filippi, D. J. Summers, G. Rizzo, S. I. Serednyakov, F. Palombo, G. Calderini, A. Soffer, D. S. Chao, S. Martellotti, G. De Nardo, Alberto Lusiani, Nicola Neri, H. M. Lacker, C. Chen, Biplab Dey, N. Tasneem, J. Albert, Fergus Wilson, S. J. Sekula, C. Cartaro, I. M. Peruzzi, D. J. Payne, E. Ben-Haim, E. Paoloni, R. de Sangro, P. Patteri, Yu. I. Skovpen, K. Honscheid, J. W. Gary, P. Taras, M. Heß, R. Kowalewski, M. R. Convery, N. Arnaud, T. Lueck, D. G. Hitlin, J. Chauveau, C. Hast, Simon Akar, A. R. Buzykaev, H. Koch, S. Bettarini, G. Raven, G. Finocchiaro, M. Piccolo, F. Simonetto, C. Touramanis, S. Luitz, K. R. Schubert, R. J. Sobie, A. Roodman, W. Dunwoodie, T. S. Mattison, A. Randle-Conde, W. Gradl, M. K. Sullivan, M. Verderi, R. Faccini, V. Poireau, M. A. Giorgi, J. M. Losecco, G. Marchiori, F. C. Porter, F. Bianchi, I. M. Nugent, R. Calabrese, F. Di Lodovico, E. P. Solodov, Elisa Manoni, Sw. Banerjee, A. P. Onuchin, L. Sun, Adrian John Bevan, Alessandro Pilloni, I. Garzia, S. Passaggio, D. R. Peimer, Thomas Latham, C. Patrignani, V. Tisserand, D. Aston, F. Anulli, D. Bettoni, J. M. Roney, S. Prell, W. Panduro Vazquez, B. G. Pushpawela, A. Gaz, S. H. Robertson, M. V. Purohit, Timothy Gershon, D. A. Roberts, E. Gabathuler, P. F. Harrison, A. M. Eisner, L. Cremaldi, Roger Barlow, J. R. Wilson, and T. S. Miyashita

Subjects
S system, Physics, 010308 nuclear & particles physics, Branching fraction, Detector, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, Mass spectrum, Spectral function, 010306 general physics, Collider, Energy (signal processing)
Abstract

The decay τ^− → K^−K_Sν_τ has been studied using 430×10^6 e^+e^− → τ^+τ^− events produced at a center-of-mass energy around 10.6 GeV at the PEP-II collider and studied with the BABAR detector. The mass spectrum of the K^−K_S system has been measured and the spectral function has been obtained. The measured branching fraction B(τ^− → K^−K_Sν_τ) = (0.739 ± 0.011(stat) ± 0.020(syst)) × 10^(-3) is found to be in agreement with earlier measurements.

Published
2018

47. Quantification of Catalytic Activity for Electrostatically Enhanced Thioureas via Reaction Kinetics and UV-vis Spectroscopic Measurement

Author

Yang Fan, Curtis Payne, and Steven R. Kass

Subjects
Trifluoromethyl, 010405 organic chemistry, Hydrogen bond, Chemistry, Organic Chemistry, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences, Catalysis, chemistry.chemical_compound, Ultraviolet visible spectroscopy, Thiourea, Polymer chemistry, Reactivity (chemistry), Pyridinium, Trifluoromethanesulfonate
Abstract

Charged thiourea derivatives containing one and two methylated or octylated pyridinium ion centers and a tetraarylborate or triflate counteranion are reported. These novel catalysts are much more active in the Friedel-Crafts reactions of trans-β-nitroalkenes with N-methylindoles than the privileged N, N'-bis(3,5-bis(trifluoromethyl)phenyl)thiourea (i.e., Schreiner's thiourea) by up to 2-3 orders of magnitude. A previously reported UV-vis spectroscopic method by Kozlowski et al. was exploited to rationalize their reactivity order along with noncharged analogues. These results offer a new design strategy for organocatalysts by introducing positively charged centers without adding additional N-H, O-H, or S-H hydrogen bond donor sites.

Published
2018

50. Preorganized Hydrogen Bond Donor Catalysts: Acidities and Reactivities

Author

Masoud Samet and Steven R. Kass

Subjects
Trifluoromethyl, Hydrocarbons, Fluorinated, Molecular Structure, Hydrogen bond, Organic Chemistry, Adamantane, Hydrogen Bonding, Hydrogen-Ion Concentration, Medicinal chemistry, Catalysis, Acetic acid, chemistry.chemical_compound, chemistry, Solvents, Polar, Molecule, Organic chemistry, Dimethyl Sulfoxide, Acids
Abstract

Measured DMSO pKa values for a series of rigid tricyclic adamantane-like triols containing 0-3 trifluoromethyl groups (i.e., 3(0)-3(3)) are reported. The three compounds with CF3 substituents are similar or more acidic than acetic acid (pKa = 13.5 (3(1)), 9.5 (3(2)), 7.3 (3(3)) vs 12.6 (HOAc)), and the resulting hydrogen bond network enables a remote γ-trifluoromethyl group to enhance the acidity as well as one located at the α-position. Catalytic abilities of 3(0)-3(3) were also examined. In a nonpolar environment a rate enhancement of up to 100-fold over flexible acyclic analogs was observed presumably due to an entropic advantage of the locked-in structure. Gas-phase acidities are found to correlate with the catalytic activity better than DMSO pKa values and appear to be a better measure of acidities in low dielectric constant media. These trends are reduced or reversed in polar solvents highlighting the importance of the reaction environment.

Published
2015

Catalog

Books, media, physical & digital resources
See catalog results