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Title: Pulse Energy and Pulse Duration Effects in the Ionization and Fragmentation of Iodomethane by Ultraintense Hard X Rays

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [3];  [4];  [2];  [2];  [5];  [3];  [6];  [7];  [8];  [9];  [8];  [10];  [10];  [11];  [12];  [13];  [14] more »;  [12];  [12];  [12];  [15];  [16];  [12];  [17];  [18];  [2];  [19];  [20];  [1] « less
  1. Kansas State Univ., Manhattan, KS (United States)
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Center for Free-Electron Laser Science; Hamburg Centre for Ultrafast Imaging, Hamburg (Germany)
  3. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  4. Max Planck Institute for Nuclear Physics, Heidelberg (Germany); European X-ray Free-Electron Laser (XFEL), Hamburg (Germany)
  5. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Center for Free-Electron Laser Science; Hamburg Centre for Ultrafast Imaging, Hamburg (Germany); Univ. of Science and Technology, Beijing (China)
  6. Physikalisch-Technische Bundesanstalt (PTB), Braunschweig (Germany)
  7. Max Planck Institute for Medical Research, Heidelberg (Germany)
  8. Argonne National Lab. (ANL), Argonne, IL (United States)
  9. Argonne National Lab. (ANL), Argonne, IL (United States); Philipps-Universität Marburg, Marburg (Germany)
  10. Sorbonne Univ., Paris (France)
  11. Tohoku Univ., Sendai (Japan)
  12. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
  13. Argonne National Lab. (ANL), Argonne, IL (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
  14. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS); Technische Univ. Berlin (Germany)
  15. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Center for Free-Electron Laser Science
  16. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS); Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  17. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States)
  18. Argonne National Lab. (ANL), Argonne, IL (United States); Paul Scherrer Inst. (PSI), Villigen (Switzerland); Ecole Polytechnique Federale Lausanne (Switzerland)
  19. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Center for Free-Electron Laser Science; Hamburg Centre for Ultrafast Imaging, Hamburg (Germany); Univ. of Hamburg (Germany)
  20. Kansas State Univ., Manhattan, KS (United States); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
+ Show Author Affiliations

The interaction of intense femtosecond x-ray pulses with molecules sensitively depends on the interplay between multiple photoabsorptions, Auger decay, charge rearrangement, and nuclear motion. Here, we report on a combined experimental and theoretical study of the ionization and fragmentation of iodomethane (CH3I) by ultraintense (~1019 W/cm2) x-ray pulses at 8.3 keV, demonstrating how these dynamics depend on the x-ray pulse energy and duration. We show that the timing of multiple ionization steps leading to a particular reaction product and, thus, the product’s final kinetic energy, is determined by the pulse duration rather than the pulse energy or intensity. While the overall degree of ionization is mainly defined by the pulse energy, our measurement reveals that the yield of the fragments with the highest charge states is enhanced for short pulse durations, in contrast to earlier observations for atoms and small molecules in the soft x-ray domain. Finally, we attribute this effect to a decreased charge transfer efficiency at larger internuclear separations, which are reached during longer pulses.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; German Research Foundation (DFG); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; FG02-86ER13491; SC0019451; AC02-76SF00515; SC0012704
OSTI ID:
1828744
Alternate ID(s):
OSTI ID: 1822846
Report Number(s):
BNL-222176-2021-JAAM; 170135; TRN: US2216316
Journal Information:
Physical Review Letters, Vol. 127, Issue 9; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
Fragmentation
Iodomethane
Ionization
Pulse
36 MATERIALS SCIENCE
atomic & molecular processes in external fields
autoionization & Auger processes
interatomic & molecular potentials
light-matter interaction
single- and few-photon ionization & excitation
ultrafast phenomena
ultrashort pulses
x-ray beam & optics