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374 results on '"Als-Nielsen, J"'

1. Atomic-Scale Visualization of Inertial Dynamics

Author

Lindenberg, A. M., Larsson, J., Sokolowski-Tinten, K., Gaffney, K. J., Blome, C., Synnergren, O., Sheppard, J., Caleman, C., MacPhee, A. G., Weinstein, D., Lowney, D. P., Allison, T. K., Matthews, T., Falcone, R. W., Cavalieri, A. L., Fritz, D. M., Lee, S. H., Bucksbaum, P. H., Reis, D. A., Rudati, J., Fuoss, P. H., Kao, C. C., Siddons, D. P., Pahl, R., Als-Nielsen, J., Duesterer, S., Ischebeck, R., Schlarb, H., Schulte-Schrepping, H., Schneider, J., von der Linde, D., Hignette, O., Sette, F., Chapman, H. N., Lee, R. W., Hansen, T. N., Techert, S., Wark, J. S., Bergh, M., Huldt, G., van der Spoel, D., Timneanu, N., Hajdu, J., Akre, R. A., Bong, E., Krejcik, P., Arthur, J., Brennan, S., Luening, K., and Hastings, J. B.

Published
2005

11. X-ray synchrotron study of packing and protrusions of polymer-lipid monolayers at the air-water interface

Author

Majewski, J., Kuhl, T.L., Kjaer, K., Gerstenberg, M.C., Als-Nielsen, J., Israelachvili, J.N., and Smith, G.S.

Subjects
Polymers -- Research, Lipids -- Analysis, Membranes (Biology) -- Research, Chemistry
Abstract

Lipids with bulky hydrophilic polymer headgroups were observed to have large fluctuations normal to the monolayer plane, causing a systematic roughening of the interface and a decline in the coherently Bragg-scattering tail thickness with increasing polymer-lipid content. Findings indicated that bulky hydrophilic moieties result into substantial out-of-plan protrusions of phospholipid monolayers and presumably bilayers, vesicles and biological membranes.

Published
1998

12. Design of two-dimensional crystals as models for probing the structure of the solid-liquid interface

Author

Gidalevitz, D., Weissbuch, I., Kjaer, K., Als-Nielsen, J., and Leiserowtiz, L.

Subjects
Cadmium -- Research, Alanine -- Research, Chemistry
Abstract

The effect of CdCl2 on the structure of mixed monolayer of steric acid and octadecylamine elucidated morphological changes of beta-alanine when grown in the presence of Cl- and Cl2+ ions. Cl2+ and Cl- ions, which bind to the sites, simulate mosaic crystalline pattern formation. This monolayer system exhibits ordered counterions of opposite charges.

Published
1994

17. Formation of secondary electron cascades in single-crystalline plasma-deposited diamond upon exposure to femtosecond x-ray pulses.

Author

Gabrysch, M., Marklund, E., Hajdu, J., Twitchen, D. J., Rudati, J., Lindenberg, A. M., Caleman, C., Falcone, R. W., Tschentscher, T., Moffat, K., Bucksbaum, P. H., Als-Nielsen, J., Nelson, A. J., Siddons, D. P., Emma, P. J., Krejcik, P., Schlarb, H., Arthur, J., Brennan, S., and Hastings, J.

Subjects
ELECTRONS, CHEMICAL vapor deposition, ULTRASHORT laser pulses, DIAMONDS, CRYSTALS, PHYSICS
Abstract

Secondary electron cascades were measured in high purity single-crystalline chemical vapor deposition (CVD) diamond, following exposure to ultrashort hard x-ray pulses (140 fs full width at half maximum, 8.9 keV energy) from the Sub-Picosecond Pulse Source at the Stanford Linear Accelerator Center. We report measurements of the pair creation energy and of drift mobility of carriers in two CVD diamond crystals. This was done for the first time using femtosecond x-ray excitation. Values for the average pair creation energy were found to be 12.17±0.57 and 11.81±0.59 eV for the two crystals, respectively. These values are in good agreement with recent theoretical predictions. The average drift mobility of carriers, obtained by the best fit to device simulations, was μh=2750 cm2/V s for holes and was μe=2760 cm2/V s for electrons. These mobility values represent lower bounds for charge mobilities due to possible polarization of the samples. The results demonstrate outstanding electric properties and the enormous potential of diamond in ultrafast x-ray detectors. [ABSTRACT FROM AUTHOR]

Published
2008
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29. Observation of Structural Anisotropy and the Onset of Liquidlike Motion During the Nonthermal Melting of InSb. Physical Review Letter

Author

Gaffney, K., Lindenberg, A., Larsson, J., Sokolowski-Tinten, K., Blome, C., Synnergren, O., Sheppard, J., Caleman, C., MacPhee, A., Weinstein, D., Lowney, D., Allison, T., Matthews, T., Falcone, R., Cavalieri, A., Fritz, D., Lee, S., Bucksbaum, P., Reis, D., Rudati, J., Macrander, A., Fuoss, P., Kao, C., Siddons, D., Pahl, R., Moffat, K., Als-Nielsen, J., Düsterer, S., Ischebeck, R., Schlarb, H., Schulte-Schrepping, H., Schneider, J., von der Linde, D., Hignette, O., Sette, F., Chapman, H., Lee, R., Hansen, T., Wark, J., Bergh, M., Huldt, G., van der Spoel, D., Timneanu, N., Hajdu, J., Akre, R., Bong, E., Krejcik, P., Arthur, J., Brennan, S., Luening, K., and Hastings, J.

Subjects
ddc:550
Published
2005

30. Formation of secondary electron cascades in single-crystalline plasma-deposited diamond upon exposure to femtosecond x-ray pulses

Author

Gabrysch, Markus, Marklund, Erik, Hajdu, Janos, Twitchen, D. J., Rudati, J., Lindenberg, A. M., Caleman, Carl, Falcone, R. W., Tschentscher, T., Moffat, K., Bucksbaum, P. H., Als-Nielsen, J., Nelson, A. J., Siddons, D. P., Emma, P. J., Krejcik, P., Schlarb, H., Arthur, J., Brennan, S., Hastings, J., Isberg, Jan, Gabrysch, Markus, Marklund, Erik, Hajdu, Janos, Twitchen, D. J., Rudati, J., Lindenberg, A. M., Caleman, Carl, Falcone, R. W., Tschentscher, T., Moffat, K., Bucksbaum, P. H., Als-Nielsen, J., Nelson, A. J., Siddons, D. P., Emma, P. J., Krejcik, P., Schlarb, H., Arthur, J., Brennan, S., Hastings, J., and Isberg, Jan

Abstract

Secondary electron cascades were measured in high purity single-crystalline chemical vapor deposition (CVD) diamond, following exposure to ultrashort hard x-ray pulses (140 fs full width at half maximum, 8.9 keV energy) from the Sub-Picosecond Pulse Source at the Stanford Linear Accelerator Center. We report measurements of the pair creation energy and of drift mobility of carriers in two CVD diamond crystals. This was done for the first time using femtosecond x-ray excitation. Values for the average pair creation energy were found to be 12.17 +/- 0.57 and 11.81 +/- 0.59 eV for the two crystals, respectively. These values are in good agreement with recent theoretical predictions. The average drift mobility of carriers, obtained by the best fit to device simulations, was mu(h)= 2750 cm(2)/V s for holes and was mu(e)= 2760 cm(2) / V s for electrons. These mobility values represent lower bounds for charge mobilities due to possible polarization of the samples. The results demonstrate outstanding electric properties and the enormous potential of diamond in ultrafast x-ray detectors.

Published
2008
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31. Self-aggregation of a,co-Alkanediols into Two and Three Dimensional Crystallites at the Air-Water Interface. Relevance to Ice Nucleation

Author

Popovitz-Biro, R., Ron Edgar, Majewski, J., Cohen, S., Margulis, L., Kjaer, K., Als-Nielsen, J., Leiserowitz, L., and Lahav, M.

Abstract

A correlation is presented between the crystalline structure of monolayers and multilayers of a,co-alkanediols HO-(CH2)„-OH (n = 16, 18, 19, 21, 22, 23, 24, 30) at the air-water interface and their function as ice nucleators. Structural elucidation was carried out by the following methods; grazing incidence X-ray diffraction, scanning force microscopy, cryo-transmission electron microscopy and external reflection Fourier transform-infrared spectroscopy.

Published
1996

32. Observation of structural anisotropy and the onset of liquidlike motion during the nonthermal melting of InSb.

Author

Gaffney, K J, Lindenberg, A M, Larsson, J, Sokolowski-Tinten, K, Blome, C, Synnergren, O, Sheppard, J, Caleman, C, MacPhee, A G, Weinstein, D, Lowney, D P, Allison, T, Matthews, T, Falcone, R W, Cavalieri, A L, Fritz, D M, Lee, S H, Bucksbaum, P H, Reis, D A, Rudati, J, Macrander, A T, Fuoss, P H, Kao, C C, Siddons, D P, Pahl, R, Moffat, K, Als-Nielsen, J, Duesterer, S, Ischebeck, R, Schlarb, H, Schulte-Schrepping, H, Schneider, J, von der Linde, D, Hignette, O, Sette, F, Chapman, H N, Lee, R W, Hansen, T N, Wark, J S, Bergh, M, Huldt, G, van der Spoel, D, Timneanu, N, Hajdu, J, Akre, R A, Bong, E, Krejcik, P, Arthur, J, Brennan, S, Luening, K, Hastings, J B, Gaffney, K J, Lindenberg, A M, Larsson, J, Sokolowski-Tinten, K, Blome, C, Synnergren, O, Sheppard, J, Caleman, C, MacPhee, A G, Weinstein, D, Lowney, D P, Allison, T, Matthews, T, Falcone, R W, Cavalieri, A L, Fritz, D M, Lee, S H, Bucksbaum, P H, Reis, D A, Rudati, J, Macrander, A T, Fuoss, P H, Kao, C C, Siddons, D P, Pahl, R, Moffat, K, Als-Nielsen, J, Duesterer, S, Ischebeck, R, Schlarb, H, Schulte-Schrepping, H, Schneider, J, von der Linde, D, Hignette, O, Sette, F, Chapman, H N, Lee, R W, Hansen, T N, Wark, J S, Bergh, M, Huldt, G, van der Spoel, D, Timneanu, N, Hajdu, J, Akre, R A, Bong, E, Krejcik, P, Arthur, J, Brennan, S, Luening, K, and Hastings, J B

Published
2005

33. Clocking femtosecond X rays.

Author

Cavalieri, A L, Fritz, D M, Lee, S H, Bucksbaum, P H, Reis, D A, Rudati, J, Mills, D M, Fuoss, P H, Stephenson, G B, Kao, C C, Siddons, D P, Lowney, D P, Macphee, A G, Weinstein, D, Falcone, R W, Pahl, R, Als-Nielsen, J, Blome, C, Düsterer, S, Ischebeck, R, Schlarb, H, Schulte-Schrepping, H, Tschentscher, Th, Schneider, J, Hignette, O, Sette, F, Sokolowski-Tinten, K, Chapman, H N, Lee, R W, Hansen, T N, Synnergren, O, Larsson, J, Techert, S, Sheppard, J, Wark, J S, Bergh, M, Caleman, C, Huldt, G, van der Spoel, D, Timneanu, N, Hajdu, J, Akre, R A, Bong, E, Emma, P, Krejcik, P, Arthur, J, Brennan, S, Gaffney, K J, Lindenberg, A M, Luening, K, Hastings, J B, Cavalieri, A L, Fritz, D M, Lee, S H, Bucksbaum, P H, Reis, D A, Rudati, J, Mills, D M, Fuoss, P H, Stephenson, G B, Kao, C C, Siddons, D P, Lowney, D P, Macphee, A G, Weinstein, D, Falcone, R W, Pahl, R, Als-Nielsen, J, Blome, C, Düsterer, S, Ischebeck, R, Schlarb, H, Schulte-Schrepping, H, Tschentscher, Th, Schneider, J, Hignette, O, Sette, F, Sokolowski-Tinten, K, Chapman, H N, Lee, R W, Hansen, T N, Synnergren, O, Larsson, J, Techert, S, Sheppard, J, Wark, J S, Bergh, M, Caleman, C, Huldt, G, van der Spoel, D, Timneanu, N, Hajdu, J, Akre, R A, Bong, E, Emma, P, Krejcik, P, Arthur, J, Brennan, S, Gaffney, K J, Lindenberg, A M, Luening, K, and Hastings, J B

Abstract

Linear-accelerator-based sources will revolutionize ultrafast x-ray science due to their unprecedented brightness and short pulse duration. However, time-resolved studies at the resolution of the x-ray pulse duration are hampered by the inability to precisely synchronize an external laser to the accelerator. At the Sub-Picosecond Pulse Source at the Stanford Linear-Accelerator Center we solved this problem by measuring the arrival time of each high energy electron bunch with electro-optic sampling. This measurement indirectly determined the arrival time of each x-ray pulse relative to an external pump laser pulse with a time resolution of better than 60 fs rms.

Published
2005

34. Atomic-scale visualization of inertial dynamics.

Author

Lindenberg, A M, Larsson, J, Sokolowski-Tinten, K, Gaffney, K J, Blome, C, Synnergren, O, Sheppard, J, Caleman, C, Macphee, A G, Weinstein, D, Lowney, D P, Allison, T K, Matthews, T, Falcone, R W, Cavalieri, A L, Fritz, D M, Lee, S H, Bucksbaum, P H, Reis, D A, Rudati, J, Fuoss, P H, Kao, C C, Siddons, D P, Pahl, R, Als-Nielsen, J, Duesterer, S, Ischebeck, R, Schlarb, H, Schulte-Schrepping, H, Tschentscher, Th, Schneider, J, von der Linde, D, Hignette, O, Sette, F, Chapman, H N, Lee, R W, Hansen, T N, Techert, S, Wark, J S, Bergh, M, Huldt, G, van der Spoel, D, Timneanu, N, Hajdu, J, Akre, R A, Bong, E, Krejcik, P, Arthur, J, Brennan, S, Luening, K, Hastings, J B, Lindenberg, A M, Larsson, J, Sokolowski-Tinten, K, Gaffney, K J, Blome, C, Synnergren, O, Sheppard, J, Caleman, C, Macphee, A G, Weinstein, D, Lowney, D P, Allison, T K, Matthews, T, Falcone, R W, Cavalieri, A L, Fritz, D M, Lee, S H, Bucksbaum, P H, Reis, D A, Rudati, J, Fuoss, P H, Kao, C C, Siddons, D P, Pahl, R, Als-Nielsen, J, Duesterer, S, Ischebeck, R, Schlarb, H, Schulte-Schrepping, H, Tschentscher, Th, Schneider, J, von der Linde, D, Hignette, O, Sette, F, Chapman, H N, Lee, R W, Hansen, T N, Techert, S, Wark, J S, Bergh, M, Huldt, G, van der Spoel, D, Timneanu, N, Hajdu, J, Akre, R A, Bong, E, Krejcik, P, Arthur, J, Brennan, S, Luening, K, and Hastings, J B

Abstract

The motion of atoms on interatomic potential energy surfaces is fundamental to the dynamics of liquids and solids. An accelerator-based source of femtosecond x-ray pulses allowed us to follow directly atomic displacements on an optically modified energy landscape, leading eventually to the transition from crystalline solid to disordered liquid. We show that, to first order in time, the dynamics are inertial, and we place constraints on the shape and curvature of the transition-state potential energy surface. Our measurements point toward analogies between this nonequilibrium phase transition and the short-time dynamics intrinsic to equilibrium liquids.

Published
2005

35. Clocking femtosecond X-rays

Author

Cavalieri, A.L., Fritz, D.M., Lee, S.H., Bucksbaum, P.H., Reis, D.A., Mills, D.M., Pahl, R, Rudati, J, Fuoss, P.H., Stephenson, G.B., Lowney, D.P., MacPhee, A.G., Weinstein, D, Falcone, R.W., Als-Nielsen, J, Blome, C, Ischebeck, R, Schlarb, H, Tschenscher, Th, Schneider, J, Sokolowski-Tinten, K, Chapman, H.N., Lee, R.W., Hansen, Tue, Synnergren, Ola, Larsson, Jörgen, Teschert, S, Sheppard, J, Wark, J.S., Bergh, M, Caleman, C, Huldt, G, van der Spoel, D, Timneanu, N, Hajdu, J, Bong, E, Emma, P, Krejicik, P, Arthur, J, Brennan, S, Gaffney, K.J., Lindenberg, A.M., Hastings, J.B., Cavalieri, A.L., Fritz, D.M., Lee, S.H., Bucksbaum, P.H., Reis, D.A., Mills, D.M., Pahl, R, Rudati, J, Fuoss, P.H., Stephenson, G.B., Lowney, D.P., MacPhee, A.G., Weinstein, D, Falcone, R.W., Als-Nielsen, J, Blome, C, Ischebeck, R, Schlarb, H, Tschenscher, Th, Schneider, J, Sokolowski-Tinten, K, Chapman, H.N., Lee, R.W., Hansen, Tue, Synnergren, Ola, Larsson, Jörgen, Teschert, S, Sheppard, J, Wark, J.S., Bergh, M, Caleman, C, Huldt, G, van der Spoel, D, Timneanu, N, Hajdu, J, Bong, E, Emma, P, Krejicik, P, Arthur, J, Brennan, S, Gaffney, K.J., Lindenberg, A.M., and Hastings, J.B.

Abstract

Linear-accelerator-based sources will revolutionize ultrafast x-ray science due to their unprecedented brightness and short pulse duration. However, time-resolved studies at the resolution of the x-ray pulse duration are hampered by the inability to precisely synchronize an external laser to the accelerator. At the Sub-Picosecond Pulse Source at the Stanford Linear-Accelerator Center we solved this problem by measuring the arrival time of each high energy electron bunch with electro-optic sampling. This measurement indirectly determined the arrival time of each x-ray pulse relative to an external pump laser pulse with a time resolution of better than 60 fs rms.

Published
2005

36. Observation of structural anisotropy and the onset of liquidlike motion during the nonthermal melting of InSb

Author

Gaffney, KJ, Lindenberg, AM, Larsson, Jörgen, Sokolowski-Tinten, K, Blome, C, Synnergren, Ola, Sheppard, J, Caleman, C, MacPhee, AG, Weinstein, D, Lowney, DP, Allison, T, Matthews, T, Falcone, RW, Cavalieri, AL, Fritz, DM, Lee, SH, Bucksbaum, PH, Reis, DA, Rudati, J, Macrander, AT, Fuoss, PH, Kao, CC, Siddons, DP, Pahl, R, Moffat, K, Als-Nielsen, J, Duesterer, S, Ischebeck, R, Schlarb, H, Schulte-Schrepping, H, Schneider, J, von der Linde, D, Hignette, O, Sette, F, Chapman, HN, Lee, RW, Hansen, Tue, Wark, JS, Bergh, M, Huldt, G, van der Spoel, D, Timneanu, N, Hajdu, J, Akre, RA, Bong, E, Krejcik, P, Arthur, J, Brennan, S, Luening, K, Hastings, JB, Gaffney, KJ, Lindenberg, AM, Larsson, Jörgen, Sokolowski-Tinten, K, Blome, C, Synnergren, Ola, Sheppard, J, Caleman, C, MacPhee, AG, Weinstein, D, Lowney, DP, Allison, T, Matthews, T, Falcone, RW, Cavalieri, AL, Fritz, DM, Lee, SH, Bucksbaum, PH, Reis, DA, Rudati, J, Macrander, AT, Fuoss, PH, Kao, CC, Siddons, DP, Pahl, R, Moffat, K, Als-Nielsen, J, Duesterer, S, Ischebeck, R, Schlarb, H, Schulte-Schrepping, H, Schneider, J, von der Linde, D, Hignette, O, Sette, F, Chapman, HN, Lee, RW, Hansen, Tue, Wark, JS, Bergh, M, Huldt, G, van der Spoel, D, Timneanu, N, Hajdu, J, Akre, RA, Bong, E, Krejcik, P, Arthur, J, Brennan, S, Luening, K, and Hastings, JB

Abstract

The melting dynamics of laser excited InSb have been studied with femtosecond x-ray diffraction. These measurements observe the delayed onset of diffusive atomic motion, signaling the appearance of liquidlike dynamics. They also demonstrate that the root-mean-squared displacement in the [111] direction increases faster than in the [110] direction after the first 500 fs. This structural anisotropy indicates that the initially generated fluid differs significantly from the equilibrium liquid.

Published
2005

37. Macroscopic alignment of graphene stacks by Langmuir-Blodgett deposition of amphiphilic hexabenzocoronenes

Author

Laursen, B.W., Nørgaard, K., Reitzel, N., Simonsen, J. B., Nielsen, C. B., Als-Nielsen, J., Bjørnholm, T., Sølling, Theis Ivan, Nielsen, Martin Meedom, Bunk, Oliver, Kjær, Kristian, Tchebotareva, N., Watson, M.D., Mullen, K., Piris, J., Laursen, B.W., Nørgaard, K., Reitzel, N., Simonsen, J. B., Nielsen, C. B., Als-Nielsen, J., Bjørnholm, T., Sølling, Theis Ivan, Nielsen, Martin Meedom, Bunk, Oliver, Kjær, Kristian, Tchebotareva, N., Watson, M.D., Mullen, K., and Piris, J.

Abstract

e present structural studies of Langmuir V and Langmuir-Blodgett (LB) films of new amphiphilic hexa-peri-hexabenzocoronene (HBC) discotics, carrying five branched alkyl side chains and one polar group. The polar group is either a carboxylic acid moiety or an electron acceptor moiety (anthraquinone). Grazing-incidence X-ray diffraction (GIXD) and X-ray reflectivity, both utilizing synchrotron radiation, show that these amphiphilic HBCs form well-defined Langmuir monolayers at the air-water interface, with pi-stacked columnar structure where the HBC cores are rotated around the surface normal and tilted relative to the water surface. The intercolumnar distance is 20 A. The HBCs are confined to a layer lying on top of the layer of polar groups that are in contact with the water subphase. Efficient transfer of the monolayer of the anthraquinone-substituted HBC derivative to hydrophobic quartz substrates by vertical dipping gave well-defined multilayer Y-type LB films. Polarized optical spectroscopy, GIXD, and X-ray reflectivity measurements show that the LB films consist of at least two phases. Heating the films results in an irreversible rearrangement to a single macroscopically aligned phase of hexagonally packed columns oriented along the dipping direction with disk planes perpendicular to the columnar axes and stacked in a cofacial manner. This phase transition is analogous to the reversible transition observed in the bulk material.

Published
2004

40. X-ray Experiments for Students at the SLS Optics Beamline

Author

Flechsig, U., primary, Als-Nielsen, J., additional, Jaggi, A., additional, Krempaský, J., additional, Oberta, P., additional, Spielmann, S., additional, van der Veen, J. F., additional, Garrett, R., additional, Gentle, I., additional, Nugent, K., additional, and Wilkins, S., additional

Published
2010
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41. Advanced methods in scanning x-ray microscopy

Author

Menzel, A., primary, Dierolf, M., additional, Kewish, C. M., additional, Thibault, P., additional, Jefimovs, K., additional, David, C., additional, Bech, M., additional, Jensen, T. H., additional, Feidenhans'l, R., additional, Heegaard, A.-M., additional, Hansen, R., additional, Berthing, T., additional, Martinez, K. L., additional, Als-Nielsen, J., additional, Kapishnikov, S., additional, Leiserowitz, L., additional, Pfeiffer, F., additional, and Bunk, O., additional

Published
2009
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42. Observation of Structural Anisotropy and the Onset of Liquidlike Motion During the Nonthermal Melting of InSb

Author

Gaffney, K. J., primary, Lindenberg, A. M., additional, Larsson, J., additional, Sokolowski-Tinten, K., additional, Blome, C., additional, Synnergren, O., additional, Sheppard, J., additional, Caleman, C., additional, MacPhee, A. G., additional, Weinstein, D., additional, Lowney, D. P., additional, Allison, T., additional, Matthews, T., additional, Falcone, R. W., additional, Cavalieri, A. L., additional, Fritz, D. M., additional, Lee, S. H., additional, Bucksbaum, P. H., additional, Reis, D. A., additional, Rudati, J., additional, Macrander, A. T., additional, Fuoss, P. H., additional, Kao, C. C., additional, Siddons, D. P., additional, Pahl, R., additional, Moffat, K., additional, Als-Nielsen, J., additional, Duesterer, S., additional, Ischebeck, R., additional, Schlarb, H., additional, Schulte-Schrepping, H., additional, Schneider, J., additional, von der Linde, D., additional, Hignette, O., additional, Sette, F., additional, Chapman, H. N., additional, Lee, R. W., additional, Hansen, T. N., additional, Wark, J. S., additional, Bergh, M., additional, Huldt, G., additional, van der Spoel, D., additional, Timneanu, N., additional, Hajdu, J., additional, Akre, R. A., additional, Bong, E., additional, Krejcik, P., additional, Arthur, J., additional, Brennan, S., additional, Luening, K., additional, and Hastings, J. B., additional

Published
2005
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43. Clocking Femtosecond X Rays

Author

Cavalieri, A. L., primary, Fritz, D. M., additional, Lee, S. H., additional, Bucksbaum, P. H., additional, Reis, D. A., additional, Rudati, J., additional, Mills, D. M., additional, Fuoss, P. H., additional, Stephenson, G. B., additional, Kao, C. C., additional, Siddons, D. P., additional, Lowney, D. P., additional, MacPhee, A. G., additional, Weinstein, D., additional, Falcone, R. W., additional, Pahl, R., additional, Als-Nielsen, J., additional, Blome, C., additional, Düsterer, S., additional, Ischebeck, R., additional, Schlarb, H., additional, Schulte-Schrepping, H., additional, Tschentscher, Th., additional, Schneider, J., additional, Hignette, O., additional, Sette, F., additional, Sokolowski-Tinten, K., additional, Chapman, H. N., additional, Lee, R. W., additional, Hansen, T. N., additional, Synnergren, O., additional, Larsson, J., additional, Techert, S., additional, Sheppard, J., additional, Wark, J. S., additional, Bergh, M., additional, Caleman, C., additional, Huldt, G., additional, van der Spoel, D., additional, Timneanu, N., additional, Hajdu, J., additional, Akre, R. A., additional, Bong, E., additional, Emma, P., additional, Krejcik, P., additional, Arthur, J., additional, Brennan, S., additional, Gaffney, K. J., additional, Lindenberg, A. M., additional, Luening, K., additional, and Hastings, J. B., additional

Published
2005
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44. X-ray Experiments for Students at the SLS Optics Beamline.

Author

Flechsig, U., Als-Nielsen, J., Jaggi, A., Krempaský, J., Oberta, P., Spielmann, S., and van der Veen, J. F.

Subjects
*X-ray optics, *SYNCHROTRON radiation, *ELECTROMAGNETIC waves, *SYNCHROTRONS, *CALORIMETERS
Abstract

We present a X-ray training course for students. The course covers fundamental properties of synchrotron radiation and basic techniques like scattering and absorption. We prepared ten experiments together with a tutorial. The whole course takes about a week. A first student group from the University of Copenhagen passed the course in June 2009. The experiments were performed at the optics beamline of the Swiss Light Source which can be part-time allocated for training purposes. Two experiments are described in more detail: scattering from a hanging drop of water turning into ice and measurement of the power of a pink synchrotron beam using a simple calorimeter. [ABSTRACT FROM AUTHOR]

Published
2010
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46. The “Pile-up Effect” in Photon Detection.

Author

Madsen, A., Als-Nielsen, J., Zontone, F., Grübel, G., and Warwick, T.

Subjects
*X-rays, *ELECTROMAGNETIC waves, *RADIATION, *ELECTRON spectroscopy, *SYNCHROTRON radiation, *PARTICLES (Nuclear physics), *SYNCHROTRONS
Abstract

We quantify the pile-up of X-ray photons in a single-photon-counting detector with finite dead-time when subject to an intense synchrotron beam of non-Poisson distributed photons. The pile-up leads to a non-linearity between the registered count-rate and the true photon-rate when a single-channel analyzer is employed and we show that the phenomenon can be described by use of a simple statistical model. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2004
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50. The phases of phosphatidyl ethanolamine monolayers

Author

Zabel, H., Robinson, I.K., Helm, C.A., Tippmann-Krayer, P., Kenn, R.M., Möhwald, H., Als-Nielsen, J., Kjær, K., Zabel, H., Robinson, I.K., Helm, C.A., Tippmann-Krayer, P., Kenn, R.M., Möhwald, H., Als-Nielsen, J., and Kjær, K.

Published
1992

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