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Probing nucleobase photoprotection with soft x-rays
SLAC Natl Accelerator Lab, PULSE, Menlo Pk, CA 94025 USA..
SLAC Natl Accelerator Lab, PULSE, Menlo Pk, CA 94025 USA..
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2013 (English)In: XVIIITH INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA, 2013, 07004- p., UNSP 07004Conference paper, Published paper (Refereed)
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Abstract [en]

Nucleobases absorb strongly in the ultraviolet region, leading to molecular excitation into reactive states. The molecules avoid the photoreactions by funnelling the electronic energy into less reactive states on an ultrafast timescale via non-Born-Oppenheimer dynamics. Current theory on the nucleobase thymine discusses two conflicting pathways for the photoprotective dynamics. We present our first results of our free electron laser based UV-pump soft x-ray-probe study of the photoprotection mechanism of thymine. We use the high spatial sensitivity of the Auger electrons emitted after the soft x-ray pulse induced core ionization. Our transient spetra show two timescales on the order of 200 fs and 5 ps, in agreement with previous (all UV) ultrafast experiments. The timescales appear at different Auger kinetic energies which will help us to decipher the molecular dynamics.

Place, publisher, year, edition, pages
2013. 07004- p., UNSP 07004
Series
EPJ Web of Conferences, ISSN 2100-014X ; 41
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-280024DOI: 10.1051/epjconf/20134107004ISI: 000320558600179ISBN: 978-2-7598-0956-1 (print)OAI: oai:DiVA.org:uu-280024DiVA: diva2:909517
Conference
18th International Conference on Ultrafast Phenomena, JUL 08-13, 2012, Ecole Polytechnique Fed Lausanne (EPFL), Lausanne, SWITZERLAND
Available from: 2016-03-07 Created: 2016-03-07 Last updated: 2016-03-07Bibliographically approved

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