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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.

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Author details:Thomas J. A. WolfORCiD, Fabian Holzmeier, Isabella WagnerORCiD, Nora Berrah, Christoph Bostedt, John Bozek, Philip H. Bucksbaum, Ryan Coffee, James Cryan, Joe Farrell, Raimund Feifel, Todd J. MartinezORCiD, Brian McFarland, Melanie Mucke, Saikat Nandi, Francesco TarantelliORCiD, Ingo FischerORCiD, Markus GührORCiDGND
DOI:https://doi.org/10.3390/app7070681
ISSN:2076-3417
Title of parent work (English):Applied Sciences
Publisher:MDPI
Place of publishing:Basel
Publication type:Article
Language:English
Date of first publication:2017/07/01
Publication year:2017
Publishing institution:Universität Potsdam
Release date:2017/11/02
Tag:Auger electron spectroscopy; photochemistry; photofragmentation; ultrafast dynamics
Volume:7
Issue:7
Funding institution:Universität Potsdam, Publikationsfonds
Funding number:PA 2017_38
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
DDC classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Peer review:Referiert
Grantor:Publikationsfonds der Universität Potsdam
Publishing method:Open Access
License (German):License LogoCC-BY - Namensnennung 4.0 International
External remark:Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe ; 386
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