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

Journal Article · · Applied Sciences
DOI:https://doi.org/10.3390/app7070681· OSTI ID:1390703
 [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)
+ Show Author Affiliations

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.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1390703
Journal Information:
Applied Sciences, Vol. 7, Issue 7; ISSN 2076-3417
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

References (34)

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Cited By (4)

Computing the Ultrafast and Radiationless Electronic Excited State Decay of Cytosine and 5‐methyl‐cytosine Cations: Uncovering the Role of Dynamic Electron Correlation journal May 2019
Modeling multidimensional spectral lineshapes from first principles: application to water-solvated adenine journal January 2020
Normal and resonant Auger spectroscopy of isocyanic acid, HNCO journal July 2018
Photochemical pathways in nucleobases measured with an X-ray FEL
  • Wolf, Thomas J. A.; Gühr, Markus
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2145 https://doi.org/10.1098/rsta.2017.0473
journal April 2019

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Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ultrafast dynamics
Auger electron spectroscopy
photofragmentation
photochemistry