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000605144 1001_ $$0P:(DE-H253)PIP1087654$$aLever, Fabiano$$b0$$eCorresponding author
000605144 245__ $$aDirect observation of $ππ^*$ to $nπ^*$ transition in 2-thiouracil via time resolved NEXAFS spectroscopy
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000605144 520__ $$aThe photophysics of nucleobases has been the object of both theoretical and experimental studies over the past decades, due to the challenges posed by the non-BOA (Born-Oppenheimer Approximation) dynamics in their relaxation pathway. In this context, the ultrafast dynamics of 2-thiouracil has been investigated with a time-resolved NEXAFS study at the Free Electron Laser FLASH.We show that x-ray absorption spectroscopy can be used to observe electronic transitions in ultrafast molecular relaxation. We use a uv-pump / x-ray probe scheme to measure the changes induced by photoexcitation to the x-ray absorption at the sulfur 2s and 2p edges, identifying absorption features corresponding to the S2 (ππ*) and S1 (nπ*) electronic states. We observe a delay of 102 ± 11 fs in the population of the nπ* state with respect to the initial optical excitation. We furthermore identify the presence of coherent oscillations in the absorption signal that match a similar observation in our previous x-ray photoelectron spectroscopy study.
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000605144 7001_ $$0P:(DE-HGF)0$$aPicconi, David$$b1
000605144 7001_ $$0P:(DE-H253)PIP1087484$$aMayer, Dennis$$b2
000605144 7001_ $$0P:(DE-H253)PIP1032739$$aAlisauskas, Skirmantas$$b3
000605144 7001_ $$0P:(DE-H253)PIP1023238$$aCalegari, Francesca$$b4
000605144 7001_ $$0P:(DE-H253)PIP1002687$$aDuesterer, Stefan$$b5
000605144 7001_ $$0P:(DE-H253)PIP1009717$$aFeifel, Raimund$$b6
000605144 7001_ $$0P:(DE-H253)PIP1003607$$aKuhlmann, Marion$$b7
000605144 7001_ $$0P:(DE-H253)PIP1013759$$aMazza, Tommaso$$b8
000605144 7001_ $$0P:(DE-H253)PIP1084048$$aMetje, Jan$$b9
000605144 7001_ $$0P:(DE-H253)PIP1084984$$aRobinson, Matthew$$b10
000605144 7001_ $$0P:(DE-H253)PIP1088196$$aSquibb, Richard$$b11
000605144 7001_ $$0P:(DE-H253)PIP1028302$$aTrabattoni, Andrea$$b12
000605144 7001_ $$0P:(DE-H253)PIP1082641$$aWare, Matthew$$b13
000605144 7001_ $$0P:(DE-HGF)0$$aSaalfrank, Peter$$b14
000605144 7001_ $$0P:(DE-H253)PIP1087880$$aWolf, Thomas$$b15
000605144 7001_ $$0P:(DE-H253)PIP1084094$$aGuehr, Markus$$b16$$eCorresponding author
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