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Observing Femtosecond Fragmentation Using Ultrafast X-ray-Induced Auger Spectra
Stanford PULSE Institute, SLAC National Accelerator Laboratory.ORCID iD: 0000-0002-0641-1279
Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin; Institut für Physikalische & Theoretische Chemie, Universität Würzburg.
Institut für Physikalische & Theoretische Chemie, Universität Würzburg.
Department of Physics, University of Connecticut.
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2017 (English)In: Applied Sciences, E-ISSN 2076-3417, Vol. 7, no 7, article id 681Article in journal (Refereed) Published
Abstract [en]

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 thymines 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.

Place, publisher, year, edition, pages
2017. Vol. 7, no 7, article id 681
Keyword [en]
ultrafast dynamics, Auger electron spectroscopy, photofragmentation, photochemistry
National Category
Materials Chemistry Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-334101DOI: 10.3390/app7070681ISI: 000407700400038OAI: oai:DiVA.org:uu-334101DiVA, id: diva2:1161141
Funder
Swedish Research CouncilGöran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of TechnologyKnut and Alice Wallenberg Foundation
Available from: 2017-11-29 Created: 2017-11-29 Last updated: 2017-12-01Bibliographically approved

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