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1. Ion-momentum imaging of dissociative electron attachment dynamics in acetylene

Author

Fogle, M., Haxton, D. J., Landers, A. L., Orel, A. E., and Rescigno, T. N.

Subjects
Physics - Chemical Physics
Abstract

We present experimental results for dissociative electron attachment to acetylene near the 3 eV $^2\Pi_g$ resonance. In particular, we use an ion-momentum imaging technique to investigate the dissociation channel leading to C$_2$H$^-$ fragments. From our measured ion-momentum results we extract fragment kinetic energy and angular distributions. We directly observe a significant dissociation bending dynamic associated with the formation of the transitory negative ion. In modeling this bending dynamic with \emph{ab initio} electronic structure and fixed-nuclei scattering calculations we obtain good agreement with the experiment.

Published
2014
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2. Dissociative electron attachment to carbon dioxide via the ^2\Pi_u shape resonance

Author

Moradmand, A., Slaughter, D. S., Haxton, D. J., Rescigno, T. N., McCurdy, C. W., Weber, Th., Matsika, Spiridoula, Landers, A. L., Belkacem, A., and Fogle, M.

Subjects
Physics - Chemical Physics
Abstract

Momentum imaging measurements from two experiments are presented and interpreted with the aid of new ab initio theoretical calculations to describe the dissociative electron attachment (DEA) dynamics. We address the problem of how the 4 eV ^2\Pi_u shape resonance in CO_2 proceeds to dissociate to CO(^1\Sigma^+) + O^-(^2P) by DEA.

Published
2013
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3. Observation of the dynamics leading to a conical intersection in dissociative electronattachment to water

Author

Haxton, D.

Subjects
Atomic and molecular physics, dissociative electron attachment conical intersection
Abstract

Following prior work on the lower-energy resonances, we apply techniques of momentum imaging and ab initio scattering calculations to the process of dissociative electron attachment to water via the highest-energy 2B2 resonance. We focus on the H- anion fragment, which is produced via dynamics passing through and avoiding the conical intersection with the lower A1 state, leading to OH (2Pi) and OH (2Sigma), respectively. The momentum imaging technique, when combined with theoretical calculations on the attachment amplitude and dissociation dynamics, demonstrates that the angular distributions provide a signature of the location of the conical intersection in the spaceof nuclear configurations.

Published
2011

4. New Science Opportunities Enabled by LCLS-II X-Ray Lasers

Author

Abbamonte, P., primary, Abild-Pedersen, Frank, additional, Adams, P., additional, Ahmed, M., additional, Albert, F., additional, Mori, R., additional, Anfinrud, P., additional, Aquila, A., additional, Armstrong, M., additional, Arthur, J., additional, Bargar, J., additional, Barty, A., additional, Bergmann, U., additional, Berrah, N., additional, Blaj, G., additional, Bluhm, H., additional, Bolme, C., additional, Bostedt, C., additional, Boutet, S., additional, Brown, G., additional, Bucksbaum, P., additional, Cargnello, M., additional, Carini, G., additional, Cavalleri, A., additional, Cherezov, V., additional, Chiu, W., additional, Chuang, Y., additional, Cocco, D., additional, Coffee, R., additional, Collins, G., additional, Cordones-Hahn, A., additional, Cryan, J., additional, Dakovski, G., additional, Dantus, M., additional, Demirci, H., additional, Denes, P., additional, Devereaux, T., additional, Ding, Y., additional, Doniach, S., additional, Dorner, R., additional, Dunne, M., additional, Durr, H., additional, Egami, T., additional, Eisenberg, D., additional, Emma, P., additional, Fadley, C., additional, Falcone, R., additional, Feng, Y., additional, Fischer, P., additional, Fiuza, F., additional, Fletcher, L., additional, Foucar, L., additional, Frank, M., additional, Fraser, J., additional, Frei, H., additional, Fritz, D., additional, Fromme, P., additional, Fry, A., additional, Fuchs, M., additional, Fuoss, P., additional, Gaffney, K., additional, Gamboa, E., additional, Gessner, O., additional, Ghimire, S., additional, Gleason, A., additional, Glenzer, S., additional, Gorkhover, T., additional, Gray, A., additional, Guehr, M., additional, Guo, J., additional, Hajdu, J., additional, Hansen, S., additional, Hart, P., additional, Hashimoto, M., additional, Hastings, J., additional, Haxton, D., additional, Heimann, P., additional, Heinz, T., additional, Hexemer, A., additional, Hill, J., additional, Himpsel, F., additional, Ho, P., additional, Hogue, B., additional, Huang, Z., additional, Hunter, M., additional, Hura, G., additional, Huse, N., additional, Hussain, Z., additional, Ilchen, M., additional, Jacobsen, C., additional, Kenney, C., additional, Kern, J., additional, Kevan, S., additional, Kim, J., additional, Kim, H., additional, Kirchmann, P., additional, Kirian, R., additional, Kivelson, S., additional, Kliewer, C., additional, Koralek, J., additional, Kovacsova, G., additional, Lanzara, A., additional, LaRue, J., additional, Lee, H., additional, Lee, J., additional, Lee, W., additional, Lee, Y., additional, Lindau, I., additional, Lindenberg, A., additional, Liu, Z., additional, Lu, D., additional, Lundstrom, U., additional, MacDowell, A., additional, Mao, W., additional, Marangos, J., additional, Marcus, G., additional, Martinez, T., additional, McCurdy, W., additional, McDermott, G., additional, McGuffey, C., additional, Minitti, M., additional, Miyabe, S., additional, Moeller, S., additional, Moore, R., additional, Mukamel, S., additional, Nass, K., additional, Natan, A., additional, Nelson, K., additional, Nemsak, S., additional, Neumark, D., additional, Neutze, R., additional, Nilsson, A., additional, Nordlund, D., additional, Norskov, J., additional, Nozawa, S., additional, Ogasawara, H., additional, Ohldag, H., additional, Orville, A., additional, Osborn, D., additional, Osipov, T., additional, Ourmazd, A., additional, Parkinson, D., additional, Pellegrini, C., additional, Phillips, G., additional, Rasing, T., additional, Raubenheimer, T., additional, Recigno, T., additional, Reid, A., additional, Reis, D., additional, Robert, A., additional, Robinson, J., additional, Rolles, D., additional, Rost, J., additional, Roy, S., additional, Rudenko, A., additional, Russell, T., additional, Sandberg, R., additional, Sandhu, A., additional, Sauter, N., additional, Schlichting, I., additional, Schlogl, R., additional, Schlotter, W., additional, Schmidt, M., additional, Schneider, J., additional, Schoenlein, R., additional, Schoeffler, M., additional, Scholl, A., additional, Shen, Z., additional, Shpyrko, O., additional, Silva, T., additional, Sinha, S., additional, Slaughter, D., additional, Sobota, J., additional, Sokaras, D., additional, Sokolowski-Tinten, K., additional, Southworth, S., additional, Spence, J., additional, Stan, C., additional, Stohr, J., additional, Stroud, R., additional, Sundstrom, V., additional, Taatjes, C., additional, Thomas, A., additional, Trigo, M., additional, Tsui, Y., additional, Turner, J., additional, van Buuren, A., additional, Vinko, S., additional, Wakatsuki, S., additional, Wark, J., additional, Weber, P., additional, Weber, T., additional, Wei, M., additional, Weiss, T., additional, Wernet, P., additional, White, W., additional, Willmott, P., additional, Wilson, K., additional, Wurth, W., additional, Yachandra, V., additional, Yano, J., additional, Yarotski, D., additional, Young, L., additional, Zhu, Y., additional, Zhu, D., additional, and Zwart, P., additional

Published
2015
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7. Observation of the dynamics leading to a conical intersection in dissociative electron attachment to water

Author

Haxton, D.

Subjects
Physics, dissociative electron attachment conical intersection
Abstract

Following prior work on the lower-energy resonances, we apply techniques of momentum imaging and ab initio scattering calculations to the process of dissociative electron attachment to water via the highest-energy 2B2 resonance. We focus on the H- anion fragment, which is produced via dynamics passing through and avoiding the conical intersection with the lower A1 state, leading to OH (2Pi) and OH (2Sigma), respectively. The momentum imaging technique, when combined with theoretical calculations on the attachment amplitude and dissociation dynamics, demonstrates that the angular distributions provide a signature of the location of the conical intersection in the space of nuclear configurations.

Published
2011

9. Auger decay and subsequent fragmentation pathways of ethylene followingK-shell ionization

Author

Gaire, B., primary, Haxton, D. J., additional, Sturm, F. P., additional, Williams, J., additional, Gatton, A., additional, Bocharova, I., additional, Gehrken, N., additional, Schöffler, M., additional, Gassert, H., additional, Zeller, S., additional, Voigtsberger, J., additional, Jahnke, T., additional, Zohrabi, M., additional, Reedy, D., additional, Nook, C., additional, Landers, A. L., additional, Belkacem, A., additional, Cocke, C. L., additional, Ben-Itzhak, I., additional, Dörner, R., additional, and Weber, Th., additional

Published
2015
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13. Photo-double-ionization of ethylene and acetylene near threshold

Author

Gaire, B., primary, Lee, S. Y., additional, Haxton, D. J., additional, Pelz, P. M., additional, Bocharova, I., additional, Sturm, F. P., additional, Gehrken, N., additional, Honig, M., additional, Pitzer, M., additional, Metz, D., additional, Kim, H.-K., additional, Schöffler, M., additional, Dörner, R., additional, Gassert, H., additional, Zeller, S., additional, Voigtsberger, J., additional, Cao, W., additional, Zohrabi, M., additional, Williams, J., additional, Gatton, A., additional, Reedy, D., additional, Nook, C., additional, Müller, Thomas, additional, Landers, A. L., additional, Cocke, C. L., additional, Ben-Itzhak, I., additional, Jahnke, T., additional, Belkacem, A., additional, and Weber, Th., additional

Published
2014
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16. Electron diffraction self imaging of molecular fragmentation in two step double ionization of water

Author

Sann, H, primary, Jahnke, T, additional, Havermeier, T, additional, Kreidi, K, additional, Stuck, C, additional, Meckel, M, additional, Schöffler, M S, additional, Neumann, N, additional, Wallauer, R, additional, Voss, S, additional, Czasch, A, additional, Jagutzki, O, additional, Weber, Th, additional, Schmidt-Böcking, H, additional, Miyabe, S, additional, Haxton, D J, additional, Orel, A E, additional, Rescigno, T N, additional, and Dörner, R, additional

Published
2012
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23. Electron Diffraction Self-Imaging of Molecular Fragmentation in Two-Step Double Ionization of Water

Author

Sann, H., primary, Jahnke, T., additional, Havermeier, T., additional, Kreidi, K., additional, Stuck, C., additional, Meckel, M., additional, Schöffler, M. S., additional, Neumann, N., additional, Wallauer, R., additional, Voss, S., additional, Czasch, A., additional, Jagutzki, O., additional, Weber, Th., additional, Schmidt-Böcking, H., additional, Miyabe, S., additional, Haxton, D. J., additional, Orel, A. E., additional, Rescigno, T. N., additional, and Dörner, R., additional

Published
2011
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25. Adaniyaet al.Reply

Author

Adaniya, H., primary, Rudek, B., additional, Osipov, T., additional, Haxton, D. J., additional, Weber, T., additional, Rescigno, T. N., additional, McCurdy, C. W., additional, and Belkacem, A., additional

Published
2011
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30. Auger decay and subsequent fragmentation pathways of ethylene following K-shell ionization.

Author

Gaire, B., Haxton, D. J., Sturm, F. P., Williams, J., Gatton, A., Bocharova, I., Gehrken, N., Schöffler, M., Gassert, H., Zeller, S., Voigtsberger, J., Jahnke, T., Zohrabi, M., Reedy, D., Nook, C., Landers, A. L., Belkacem, A., Cocke, C. L., Ben-Itzhak, I., and Dörner, R.

Subjects
*AUGER effect, *FRAGMENTATION reactions, *ETHYLENE, *K-shell emission, *IONIZATION (Atomic physics)
Abstract

The fragmentation pathways and dynamics of ethylene molecules after core ionization are explored using coincident measurements of the Auger electron and fragment ions by employing the cold target recoil-ion momentum spectroscopy method. The influence of several factors on the dynamics and kinematics of the dissociation is studied. These include propensity rules, ionization mechanisms, symmetry of the orbitals from which the Auger electrons originate, multiple scattering, conical intersections, interference, and possible core-hole localization for the double ionization of this polyatomic molecule. Energy correlation maps allow probing the multidimensional potential energy surfaces and, in combination with our multiconfiguration self-consistent field calculations, identifying the populated electronic states of the dissociating dication. The measured angular distributions of the Auger electrons in the molecular frame further support and augment these assignments. The deprotonation and molecular hydrogen ion elimination channels show a nearly isotropic Auger electron angular distribution with a small elongation along the direction perpendicular to the molecular axis. For the symmetric breakup the angular distributions show a clear influence of multiple scattering on the outgoing electrons. The lowest kinetic energy release feature of the symmetric breakup channel displays a fingerprint of entangled Auger and photoelectron motion in the angular emission pattern identifying this transition as an excellent candidate to probe core-hole localization at a conical intersection of a polyatomic molecule. [ABSTRACT FROM AUTHOR]

Published
2015
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31. Vibrational Feshbach resonances in near-threshold HOCO- photodetachment: A theoretical study.

Author

Miyabe, S., Haxton, D. J., Lawler, K. V., Orel, A. E., McCurdy, C. W., and Rescigno, T.

Subjects
*NUCLEAR cross sections, *PHOTODETACHMENT threshold spectroscopy, *PHOTOELECTRONS, *STOPPING power (Nuclear physics), *DIPOLE moments, *SCATTERING (Physics), *MESOMERISM
Abstract

The results of a theoretical study of HOCO- photodetachment are presented with a view toward understanding the origin of two peaks observed by Lu and Continetti [Phys. Rev. Lett. 99, 113005 (2007)] in the photoelectron kinetic energy spectrum very close to threshold. It is shown that the peaks can be attributed to vibrational Feshbach resonances of dipole-bound trans-HOCO-, and not s- and p-wave shape resonances as previously assumed. Fixed-nuclei variational electron-HOCO scattering calculations are used to compute photodetachment cross sections and laboratory-frame photoelectron angular distributions. The calculations show a broad A″(π*)-shape resonance several electron volts above threshold. [ABSTRACT FROM AUTHOR]

Published
2011
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33. Population transfer between valence states via autoionizing states using two-color ultrafast π pulses in XUV and the limitations of adiabatic passage.

Author

Li, X., McCurdy, C. W., and Haxton, D. J.

Subjects
*VALENCE (Chemistry), *AUGER effect, *ADIABATIC ionization, *RAMAN effect, *APPROXIMATION theory, *WAVE functions
Abstract

Population transfer between two valence states of the Li atom with a Raman process via intermediate autoionizing states well above the ionization threshold is investigated using a recently developed implementation of the muticonfiguration time-dependent Hartree Fock method. It is found that a properly chosen sequence of pump and Stokes π pulses can yield a population transfer efficiency of 53% at relatively low intensities, while the extension of the stimulated Raman adiabatic passage (STIRAP) approach to the XUV in this case is far less efficient and loses its characteristic robustness at high intensities. A rule of thumb for when STIRAP is practical is given, suggesting that at still shorter wavelengths STIRAP may be possible. [ABSTRACT FROM AUTHOR]

Published
2014
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34. Dissociative electron attachment to carbon dioxide via the ²?u shape resonance.

Author

Moradmand, A., Slaughter, D. S., Haxton, D. J., Rescigno, T. N., McCurdy, C. W., Weber, Th., Matsika, S., Landers, A. L., Belkacem, A., and Fogle, M.

Subjects
*CARBON dioxide, *AB initio quantum chemistry methods, *LOW energy electron diffraction, *KINETIC energy, *ANGULAR distribution (Nuclear physics)
Abstract

Momentum imaging measurements from two experiments are presented and interpreted with the aid of ab initio theoretical calculations to describe the dissociative electron attachment (DEA) dynamics of CO2. The dynamics of the transient negative ions of CO2- involve several conical intersections taking part in mechanisms that have only recently been understood. We address the problem of how the 4-eV ²Î u shape resonance in CO2 proceeds to dissociate to CO(¹Î£+) + Oâ'(²P) by DEA. [ABSTRACT FROM AUTHOR]

Published
2013
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35. Attosecond delays in X-ray molecular ionization.

Author

Driver T, Mountney M, Wang J, Ortmann L, Al-Haddad A, Berrah N, Bostedt C, Champenois EG, DiMauro LF, Duris J, Garratt D, Glownia JM, Guo Z, Haxton D, Isele E, Ivanov I, Ji J, Kamalov A, Li S, Lin MF, Marangos JP, Obaid R, O'Neal JT, Rosenberger P, Shivaram NH, Wang AL, Walter P, Wolf TJA, Wörner HJ, Zhang Z, Bucksbaum PH, Kling MF, Landsman AS, Lucchese RR, Emmanouilidou A, Marinelli A, and Cryan JP

Abstract

The photoelectric effect is not truly instantaneous but exhibits attosecond delays that can reveal complex molecular dynamics 1-7 . Sub-femtosecond-duration light pulses provide the requisite tools to resolve the dynamics of photoionization 8-12 . Accordingly, the past decade has produced a large volume of work on photoionization delays following single-photon absorption of an extreme ultraviolet photon. However, the measurement of time-resolved core-level photoionization remained out of reach. The required X-ray photon energies needed for core-level photoionization were not available with attosecond tabletop sources. Here we report measurements of the X-ray photoemission delay of core-level electrons, with unexpectedly large delays, ranging up to 700 as in NO near the oxygen K-shell threshold. These measurements exploit attosecond soft X-ray pulses from a free-electron laser to scan across the entire region near the K-shell threshold. Furthermore, we find that the delay spectrum is richly modulated, suggesting several contributions, including transient trapping of the photoelectron owing to shape resonances, collisions with the Auger-Meitner electron that is emitted in the rapid non-radiative relaxation of the molecule and multi-electron scattering effects. The results demonstrate how X-ray attosecond experiments, supported by comprehensive theoretical modelling, can unravel the complex correlated dynamics of core-level photoionization., (© 2024. The Author(s), under exclusive licence to Springer Nature Limited.)

Published
2024
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36. Attosecond coherent electron motion in Auger-Meitner decay.

Author

Li S, Driver T, Rosenberger P, Champenois EG, Duris J, Al-Haddad A, Averbukh V, Barnard JCT, Berrah N, Bostedt C, Bucksbaum PH, Coffee RN, DiMauro LF, Fang L, Garratt D, Gatton A, Guo Z, Hartmann G, Haxton D, Helml W, Huang Z, LaForge AC, Kamalov A, Knurr J, Lin MF, Lutman AA, MacArthur JP, Marangos JP, Nantel M, Natan A, Obaid R, O'Neal JT, Shivaram NH, Schori A, Walter P, Wang AL, Wolf TJA, Zhang Z, Kling MF, Marinelli A, and Cryan JP

Abstract

In quantum systems, coherent superpositions of electronic states evolve on ultrafast time scales (few femtoseconds to attoseconds; 1 attosecond = 0.001 femtoseconds = 10 -18 seconds), leading to a time-dependent charge density. Here we performed time-resolved measurements using attosecond soft x-ray pulses produced by a free-electron laser, to track the evolution of a coherent core-hole excitation in nitric oxide. Using an additional circularly polarized infrared laser pulse, we created a clock to time-resolve the electron dynamics and demonstrated control of the coherent electron motion by tuning the photon energy of the x-ray pulse. Core-excited states offer a fundamental test bed for studying coherent electron dynamics in highly excited and strongly correlated matter.

Published
2022
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37. Electronic Population Transfer via Impulsive Stimulated X-Ray Raman Scattering with Attosecond Soft-X-Ray Pulses.

Author

O'Neal JT, Champenois EG, Oberli S, Obaid R, Al-Haddad A, Barnard J, Berrah N, Coffee R, Duris J, Galinis G, Garratt D, Glownia JM, Haxton D, Ho P, Li S, Li X, MacArthur J, Marangos JP, Natan A, Shivaram N, Slaughter DS, Walter P, Wandel S, Young L, Bostedt C, Bucksbaum PH, Picón A, Marinelli A, and Cryan JP

Abstract

Free-electron lasers provide a source of x-ray pulses short enough and intense enough to drive nonlinearities in molecular systems. Impulsive interactions driven by these x-ray pulses provide a way to create and probe valence electron motions with high temporal and spatial resolution. Observing these electronic motions is crucial to understand the role of electronic coherence in chemical processes. A simple nonlinear technique for probing electronic motion, impulsive stimulated x-ray Raman scattering (ISXRS), involves a single impulsive interaction to produce a coherent superposition of electronic states. We demonstrate electronic population transfer via ISXRS using broad bandwidth (5.5 eV full width at half maximum) attosecond x-ray pulses produced by the Linac Coherent Light Source. The impulsive excitation is resonantly enhanced by the oxygen 1s→2π^{*} resonance of nitric oxide (NO), and excited state neutral molecules are probed with a time-delayed UV laser pulse.

Published
2020
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38. Attosecond transient absorption spooktroscopy: a ghost imaging approach to ultrafast absorption spectroscopy.

Author

Driver T, Li S, Champenois EG, Duris J, Ratner D, Lane TJ, Rosenberger P, Al-Haddad A, Averbukh V, Barnard T, Berrah N, Bostedt C, Bucksbaum PH, Coffee R, DiMauro LF, Fang L, Garratt D, Gatton A, Guo Z, Hartmann G, Haxton D, Helml W, Huang Z, LaForge A, Kamalov A, Kling MF, Knurr J, Lin MF, Lutman AA, MacArthur JP, Marangos JP, Nantel M, Natan A, Obaid R, O'Neal JT, Shivaram NH, Schori A, Walter P, Li Wang A, Wolf TJA, Marinelli A, and Cryan JP

Abstract

The recent demonstration of isolated attosecond pulses from an X-ray free-electron laser (XFEL) opens the possibility for probing ultrafast electron dynamics at X-ray wavelengths. An established experimental method for probing ultrafast dynamics is X-ray transient absorption spectroscopy, where the X-ray absorption spectrum is measured by scanning the central photon energy and recording the resultant photoproducts. The spectral bandwidth inherent to attosecond pulses is wide compared to the resonant features typically probed, which generally precludes the application of this technique in the attosecond regime. In this paper we propose and demonstrate a new technique to conduct transient absorption spectroscopy with broad bandwidth attosecond pulses with the aid of ghost imaging, recovering sub-bandwidth resolution in photoproduct-based absorption measurements.

Published
2020
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39. Implementing skin-to-skin contact at birth using the Iowa model: applying evidence to practice.

Author

Haxton D, Doering J, Gingras L, and Kelly L

Subjects
Adult, Breast Feeding, Female, Humans, Infant Care methods, Infant, Newborn, Iowa, Mothers psychology, Object Attachment, Pregnancy, Skin Physiological Phenomena, Skin Temperature physiology, Touch physiology, Evidence-Based Nursing, Kangaroo-Mother Care Method methods, Mother-Child Relations, Postnatal Care methods, Postpartum Period physiology
Abstract

Prolonged skin-to-skin contact (SSC) between mothers and newborns in the hour after birth is associated with physiologic and psychological benefits for both mothers and infants, yet this is not a standard practice at all birthing facilities. The purpose of the project described in this article was to implement SSC immediately aft er birth for healthy term newborns as a routine, evidence-based practice in a labor and delivery unit at a Midwestern U.S. academic medical center. When incorporated into routine newborn care, SSC promotes key maternal-infant health outcomes of importance to quality nursing care., (© 2012 AWHONN.)

Published
2012
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40. Sustaining elimination of iodine deficiency disorders.

Author

Pandav CS, Viswanathan H, and Haxton DP

Subjects
Animals, Child, Goiter, Endemic etiology, Humans, India, Intellectual Disability etiology, Nutritional Requirements, Risk Factors, Developing Countries, Goiter, Endemic prevention & control, Intellectual Disability prevention & control, Iodine administration & dosage, Iodine deficiency, Sodium Chloride, Dietary administration & dosage
Published
1995

41. Pilot projects and nation-wide immunization in India.

Author

Haxton D

Subjects
Asia, Behavior, Demography, Developing Countries, Health, Health Planning, Health Services, India, Medicine, Organization and Administration, Population, Population Characteristics, Primary Health Care, Program Evaluation, Teaching, Tetanus, Achievement, Communicable Disease Control, Community Health Services, Delivery of Health Care, Disease, Evaluation Studies as Topic, Health Services Administration, Health Services Research, Immunization, Pilot Projects, Preventive Medicine, Research, Rural Population, Urban Population
Published
1984

42. Sugar in infant foods.

Author

Haxton DR

Subjects
Humans, Infant, Carbohydrates, Infant Food
Published
1980

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