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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 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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1 Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
2 Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France; Institut für Physikalische & Theoretische Chemie, Universität Würzburg, D-97074 Würzburg, Germany
3 Institut für Physikalische & Theoretische Chemie, Universität Würzburg, D-97074 Würzburg, Germany
4 Department of Physics, University of Connecticut, 2152 Hillside Road, Storrs, CT 06269, USA
5 Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94720, USA; Argonne National Laboratory, 9700 Cass Ave, Lemont, IL 60439, USA; Department of Physics and Astronomy, 2145 Sheridan Road, Northwestern University, Evanston, IL 60208, USA
6 Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France; Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94720, USA
7 Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA; Departments of Physics and Applied Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA
8 Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94720, USA
9 Department of Physics, University of Gothenburg, SE-412 96 Gothenburg, Sweden
10 Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA; Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, CA 94305, USA
11 Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
12 Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France; Department of Physics, Lund University, P. O. Box 118, SE-221 00 Lund, Sweden
13 Department of Chemistry, Biology and Biotechnology, University of Perugia, 06123 Perugia, Italy
14 Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA; Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam, Germany