Probing nucleobase photoprotection with soft x-rays
العنوان: | Probing nucleobase photoprotection with soft x-rays |
---|---|
المؤلفون: | McFarland, B. K., Farrell, J. P., Berrah, N., Bostedt, C., Bozek, J., Bucksbaum, P. H., Coffee, R., Cryan, J., Fang, L., Feifel, Raimund, Gaffney, K., Glownia, J., Martinez, T., Mucke, Melanie, Murphy, B., Miyabe, S., Natan, A., Osipov, T., Petrovic, V., Schorb, S., Schultz, Th., Spector, L., Tarantelli, F., Tenney, I., Wang, S., White, W., White, J., Guehr, M. |
المصدر: | XVIIITH INTERNATIONAL CONFERENCE ON ULTRAFAST PHENOMENA EPJ Web of Conferences. :07004 |
الوصف: | 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. |
وصف الملف: | electronic |
URL الوصول: | https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-280024 https://doi.org/10.1051/epjconf/20134107004 https://uu.diva-portal.org/smash/get/diva2:909517/FULLTEXT01.pdf |
قاعدة البيانات: | SwePub |
تدمد: | 2100014X |
---|---|
DOI: | 10.1051/epjconf/20134107004 |