التفاصيل البيبلوغرافية
| العنوان: |
Ultrafast X-ray Auger probing of photoexcited molecular dynamics |
| المؤلفون: |
B. K. McFarland, J. P. Farrell, S. Miyabe, F. Tarantelli, A. Aguilar, N. Berrah, C. Bostedt, J. D. Bozek, P. H. Bucksbaum, J. C. Castagna, R. N. Coffee, J. P. Cryan, L. Fang, R. Feifel |
| المصدر: |
Nature, Nature Communications. 5(1):1-7 |
| سنة النشر: |
2014 |
| الوصف: |
Molecules can efficiently and selectively convert light energy into other degrees of freedom. Disentangling the underlying ultrafast motion of electrons and nuclei of the photoexcited molecule presents a challenge to current spectroscopic approaches. Here we explore the photoexcited dynamics of molecules by an interaction with an ultrafast X-ray pulse creating a highly localized core hole that decays via Auger emission. We discover that the Auger spectrum as a function of photoexcitation—X-ray-probe delay contains valuable information about the nuclear and electronic degrees of freedom from an element-specific point of view. For the nucleobase thymine, the oxygen Auger spectrum shifts towards high kinetic energies, resulting from a particular C–O bond stretch in the ππ* photoexcited state. A subsequent shift of the Auger spectrum towards lower kinetic energies displays the electronic relaxation of the initial photoexcited state within 200 fs. Ab-initio simulations reinforce our interpretation and indicate an electronic decay to the nπ* state. |
| نوع الوثيقة: |
redif-article |
| اللغة: |
English |
| DOI: |
10.1038/ncomms5235 |
| الإتاحة: |
https://ideas.repec.org/a/nat/natcom/v5y2014i1d10.1038_ncomms5235.html |
| رقم الأكسشن: |
edsrep.a.nat.natcom.v5y2014i1d10.1038.ncomms5235 |
| قاعدة البيانات: |
RePEc |
