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000453657 245__ $$aUltrafast dynamics of 2-thiouracil investigated by time-resolved Auger spectroscopy
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000453657 520__ $$aWe present time-resolved ultraviolet-pump x-ray probe Auger spectra of 2-thiouracil. An ultraviolet induced shift towards higher kinetic energies is observed in the sulfur 2p Auger decay. The difference Auger spectra of pumped and unpumped molecules exhibit ultrafast dynamics in the shift amplitude, in which three phases can be recognized. In the first 100 fs, a shift towards higher kinetic energies is observed, followed by a 400 fs shift back to lower kinetic energies and a 1 ps shift again to higher kinetic energies. We use a simple Coulomb-model, aided by quantum chemical calculations of potential energy states, to deduce a C–S bond expansion within the first 100 fs. The bond elongation triggers internal conversion from the photoexcited S$_2$ to the S$_1$ state. Based on timescales, the subsequent dynamics can be interpreted in terms of S$_1$ nuclear relaxation and S$_1$-triplet internal conversion.
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000453657 7001_ $$0P:(DE-H253)PIP1087484$$aMayer, Dennis$$b1
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000453657 7001_ $$aWolf, T. J. A.$$b18
000453657 7001_ $$0P:(DE-H253)PIP1084094$$aGuehr, Markus$$b19$$eCorresponding author
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