Probing nucleobase photoprotection with soft x-rays
2013 (English)In: XVIIITH INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA, 2013, 07004- p., UNSP 07004Conference paper (Refereed)Text
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
, EPJ Web of Conferences, ISSN 2100-014X ; 41
IdentifiersURN: urn:nbn:se:uu:diva-280024DOI: 10.1051/epjconf/20134107004ISI: 000320558600179ISBN: 978-2-7598-0956-1OAI: oai:DiVA.org:uu-280024DiVA: diva2:909517
18th International Conference on Ultrafast Phenomena, JUL 08-13, 2012, Ecole Polytechnique Fed Lausanne (EPFL), Lausanne, SWITZERLAND