Observing femtosecond fragmentation using ultrafast X-ray-induced auger spectra

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Abstract

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 thymine0s 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.

Detaljer

Författare
  • Thomas J.A. Wolf
  • Fabian Holzmeier
  • Isabella Wagner
  • Nora Berrah
  • Christoph Bostedt
  • John Bozek
  • Phil Bucksbaum
  • Ryan Coffee
  • James Cryan
  • Joe Farrell
  • Raimund Feifel
  • Todd J. Martinez
  • Brian McFarland
  • Melanie Mucke
  • Saikat Nandi
  • Francesco Tarantelli
  • Ingo Fischer
  • Markus Gühr
Enheter & grupper
Externa organisationer
  • SLAC National Accelerator Laboratory
  • Synchrotron SOLEIL
  • Julius Maximilian University of Würzburg
  • University of Connecticut
  • Argonne National Laboratory
  • Northwestern University
  • Stanford University
  • Göteborgs universitet
  • Uppsala universitet
  • University of Perugia
  • University of Potsdam
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Acceleratorfysik och instrumentering

Nyckelord

Originalspråkengelska
Artikelnummer681
TidskriftApplied Sciences (Switzerland)
Volym7
Utgåva nummer7
StatusPublished - 2017 jul 1
PublikationskategoriForskning
Peer review utfördJa