Erlangen 2018 – scientific programme

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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