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MO: Fachverband Molekülphysik
MO 3: Photoelectron Spectroscopy
MO 3.7: Talk
Monday, March 5, 2018, 12:15–12:30, PA 2.150
Energy resolved Auger spectra of thymine after excitation with UV light — •Jan Metje1, Thomas J.A. Wolf2, and Markus Gühr1 — 1University of Potsdam, Potsdam, Germany — 2Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, USA
Energy conversion in UV-excited molecules often involves coupled electronic and nuclear dynamics not fulfilling the Born-Oppenheimer approximation. Their experimental investigation is complicated by the existence of dark nπ* states if the molecule contains heteroatoms. One such chromophore is the model system thymine.
It has been studied with a variety of time-resolved methods including non-resonant Auger and NEXAFS spectroscopy [1,2]. From the former study, it was concluded that the relaxation of UV-excited thymine involves a π/π*→ nπ* transition. The absorption of this nπ* state was observed in integrated Auger spectra of the latter study and determined to happen on a (60±30) fs timescale.
We show energy resolved Auger spectra of thymine at resonant absorption lines in NEXAFS spectra after UV excitation and discuss their sensitivity on the molecular relaxation process.
Full author list: see [2] and Jan Metje.
[1] McFarland et.al., Nature Comm. 5:4235, 2014
[2] Wolf et.al, Nature Comm. 8:29, 2017