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Title: Ultraintense X-Ray Induced Ionization, Dissociation, and Frustrated Absorption in Molecular Nitrogen

Abstract

Sequential multiple photoionization of the prototypical molecule N{sub 2} is studied with femtosecond time resolution using the Linac Coherent Light Source (LCLS). A detailed picture of intense x-ray induced ionization and dissociation dynamics is revealed, including a molecular mechanism of frustrated absorption that suppresses the formation of high charge states at short pulse durations. The inverse scaling of the average target charge state with x-ray peak brightness has possible implications for single-pulse imaging applications.

Authors:
 [1];  [2]; ; ;  [1]; ;  [3]; ;  [4]; ; ; ; ; ;  [5]; ;  [6]; ; ; more »;  [7] « less
  1. Western Michigan University Physics Department, Kalamazoo, Michigan 49008 (United States)
  2. (United States)
  3. Ultrafast X-ray Science Laboratory Chemical Sciences Division Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  4. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  5. PULSE Institute for Ultrafast Energy Science, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States)
  6. Ohio State University, Department of Physics, Columbus, Ohio 43210 (United States)
  7. Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States)
Publication Date:
OSTI Identifier:
21410438
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 104; Journal Issue: 25; Other Information: DOI: 10.1103/PhysRevLett.104.253002; (c) 2010 The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ABSORPTION; BRIGHTNESS; CHARGE STATES; DISSOCIATION; LIGHT SOURCES; LINEAR ACCELERATORS; MOLECULES; NITROGEN; PHOTOIONIZATION; PULSES; TIME RESOLUTION; X RADIATION; ACCELERATORS; ELECTROMAGNETIC RADIATION; ELEMENTS; IONIZATION; IONIZING RADIATIONS; NONMETALS; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; RADIATION SOURCES; RADIATIONS; RESOLUTION; SORPTION; TIMING PROPERTIES

Citation Formats

Hoener, M., Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Fang, L., Murphy, B., Berrah, N., Kornilov, O., Gessner, O., Pratt, S. T., Kanter, E. P., Guehr, M., Bucksbaum, P. H., Cryan, J., Glownia, M., McFarland, B., Petrovic, V., Blaga, C., DiMauro, L., Bostedt, C., Bozek, J. D., Coffee, R., and Messerschmidt, M. Ultraintense X-Ray Induced Ionization, Dissociation, and Frustrated Absorption in Molecular Nitrogen. United States: N. p., 2010. Web. doi:10.1103/PHYSREVLETT.104.253002.
Hoener, M., Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Fang, L., Murphy, B., Berrah, N., Kornilov, O., Gessner, O., Pratt, S. T., Kanter, E. P., Guehr, M., Bucksbaum, P. H., Cryan, J., Glownia, M., McFarland, B., Petrovic, V., Blaga, C., DiMauro, L., Bostedt, C., Bozek, J. D., Coffee, R., & Messerschmidt, M. Ultraintense X-Ray Induced Ionization, Dissociation, and Frustrated Absorption in Molecular Nitrogen. United States. doi:10.1103/PHYSREVLETT.104.253002.
Hoener, M., Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Fang, L., Murphy, B., Berrah, N., Kornilov, O., Gessner, O., Pratt, S. T., Kanter, E. P., Guehr, M., Bucksbaum, P. H., Cryan, J., Glownia, M., McFarland, B., Petrovic, V., Blaga, C., DiMauro, L., Bostedt, C., Bozek, J. D., Coffee, R., and Messerschmidt, M. 2010. "Ultraintense X-Ray Induced Ionization, Dissociation, and Frustrated Absorption in Molecular Nitrogen". United States. doi:10.1103/PHYSREVLETT.104.253002.
@article{osti_21410438,
title = {Ultraintense X-Ray Induced Ionization, Dissociation, and Frustrated Absorption in Molecular Nitrogen},
author = {Hoener, M. and Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 and Fang, L. and Murphy, B. and Berrah, N. and Kornilov, O. and Gessner, O. and Pratt, S. T. and Kanter, E. P. and Guehr, M. and Bucksbaum, P. H. and Cryan, J. and Glownia, M. and McFarland, B. and Petrovic, V. and Blaga, C. and DiMauro, L. and Bostedt, C. and Bozek, J. D. and Coffee, R. and Messerschmidt, M.},
abstractNote = {Sequential multiple photoionization of the prototypical molecule N{sub 2} is studied with femtosecond time resolution using the Linac Coherent Light Source (LCLS). A detailed picture of intense x-ray induced ionization and dissociation dynamics is revealed, including a molecular mechanism of frustrated absorption that suppresses the formation of high charge states at short pulse durations. The inverse scaling of the average target charge state with x-ray peak brightness has possible implications for single-pulse imaging applications.},
doi = {10.1103/PHYSREVLETT.104.253002},
journal = {Physical Review Letters},
number = 25,
volume = 104,
place = {United States},
year = 2010,
month = 6
}
  • Sequential multiple photoionization of the prototypical molecule N2 is studied with femtosecond time resolution using the Linac Coherent Light Source (LCLS). A detailed picture of intense x-ray induced ionization and dissociation dynamics is revealed, including a molecular mechanism of frustrated absorption that suppresses the formation of high charge states at short pulse durations. The inverse scaling of the average target charge state with x-ray peak brightness has possible implications for single-pulse imaging applications.
  • Radiative temperatures and electrical conductivities were measured for fluid nitrogen compressed dynamically to pressures of 18--90 GPa (180--900 kbar), temperatures of 4000--14000 K, and densities of 2--3 g/cm/sup 3/. The data show a continuous phase transition above 30 GPa shock pressure and confirm that (partialP/partialT)/sub v/<0, as indicated previously by Hugoniot equation-of-state experiments. The first observation of shock-induced cooling is also reported. The data are interpreted in terms of molecular dissociation and the concentration of dissociated molecules is calculated as a function of density and temperature.
  • Cited by 3
  • We describe the methodology of our recently developed Monte Carlo rate equation (MCRE) approach, which systematically incorporates bound-bound resonances to model multiphoton ionization dynamics induced by high-fluence, high-intensity x-ray free-electron laser (XFEL) pulses. These resonances are responsible for ionization far beyond that predicted by the sequential single photon absorption model and are central to a quantitative understanding of atomic ionization dynamics in XFEL pulses. We also present calculated multiphoton ionization dynamics for Kr and Xe atoms in XFEL pulses for a variety of conditions, to compare the effects of bandwidth, pulse duration, pulse fluence, and photon energy. This comprehensive computationalmore » investigation reveals areas in the photon energy–pulse fluence landscape where resonances are critically important. We also uncover a mechanism, preservation of inner-shell vacancies (PIVS), whereby radiation damage is enhanced at higher XFEL intensities and identify the sequence of core-outer–Rydberg, core-valence, and core-core resonances encountered during multiphoton x-ray ionization.« less