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Title: Observing Femtosecond Fragmentation Using Ultrafast X-ray-Induced Auger Spectra

Molecules often fragment after photoionization in the gas phase. Usually, this process can only be investigated spectroscopically as long as there exists electron correlation between the photofragments. Important parameters, like their kinetic energy after separation, cannot be investigated. We are reporting on a femtosecond time-resolved Auger electron spectroscopy study concerning the photofragmentation dynamics of thymine. We observe the appearance of clearly distinguishable signatures from thymine's neutral photofragment isocyanic acid. Furthermore, we observe a time-dependent shift of its spectrum, which we can attribute to the influence of the charged fragment on the Auger electron. This allows us to map our time-dependent dataset onto the fragmentation coordinate. The time dependence of the shift supports efficient transformation of the excess energy gained from photoionization into kinetic energy of the fragments. Our method is broadly applicable to the investigation of photofragmentation processes.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [1] ;  [1] ;  [1] ;  [8] ;  [7] ;  [1] ;  [9] ;  [10] ;  [11] ;  [3] ;  [12]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Synchrotron SOLEIL (France); Univ. of Wurzburg (Germany)
  3. Univ. of Wurzburg (Germany)
  4. Univ. of Connecticut, Storrs, CT (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
  6. Synchrotron SOLEIL (France); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  7. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
  8. Univ. of Gothenburg (Sweden)
  9. Uppsala Univ. (Sweden)
  10. Synchrotron SOLEIL (France); Lund Univ. (Sweden)
  11. Univ. of Perugia (Italy)
  12. SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Potsdam (Germany)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Applied Sciences
Additional Journal Information:
Journal Volume: 7; Journal Issue: 7; Journal ID: ISSN 2076-3417
Publisher:
MDPI
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ultrafast dynamics; Auger electron spectroscopy; photofragmentation; photochemistry
OSTI Identifier:
1390703