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: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
Series (Serial Number):Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe (386)
Document Type:Postprint
Date of first Publication:2017/11/02
Year of Completion:2017
Publishing Institution:Universität Potsdam
Release Date:2017/11/02
Tag:Auger electron spectroscopy; photochemistry; photofragmentation; ultrafast dynamics
Source:Applied Sciences 7 (2017) Nr. 7. - DOI: 10.3390/app7070681
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Peer Review:Referiert
Publication Way:Open Access
Licence (German):License LogoCreative Commons - Namensnennung, 4.0 International
Notes extern:Bibliographieeintrag der Originalveröffentlichung/Quelle