Journal Article

PUBDB-2021-00088

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ultrafast dynamics of 2-thiouracil investigated by time-resolved Auger spectroscopy

Lever, F.Extern* ; Mayer, D.Extern* ; Picconi, D. ; Metje, J.Extern* ; Alisauskas, S.DESY* ; Calegari, F.DESY* ; Düsterer, S.DESY* ; Ehlert, C.Extern* ; Feifel, R.Extern* ; Niebuhr, M.Extern* ; Manschwetus, B.DESY* ; Kuhlmann, M.DESY* ; Mazza, T.XFEL.EU* ; Robinson, M. S. ; Squibb, R. J. ; Trabattoni, A.CFEL*DESY* ; Wallner, M.Extern* ; Saalfrank, P. ; Wolf, T. J. A. ; Guehr, M. (Corresponding author)Extern*

2020
IOP Publ. Bristol

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Please use a persistent id in citations: doi:10.1088/1361-6455/abc9cb  doi:10.3204/PUBDB-2021-00088

Abstract: We 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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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Laser Forschung und Entwicklung (FS-LA)
3. FLASH Wissenschaftlicher Nutzerbetrieb (FS-FLASH-O)
4. Francesca Calegari (FS-CFEL-2) (CFEL-ATTO)
5. FLASH Photonen-Diagnose und Steuerungen (FS-FLASH-D)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)
3. STARLIGHT - Steering attosecond electron dynamics in biomolecules with UV-XUV LIGHT pulses (637756) (637756)

Experiment(s):

1. FLASH2 Beamline FL24 (FLASH2)

Appears in the scientific report 2020

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Database coverage:
; Clarivate Analytics Master Journal List ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Ebsco Academic Search ; Essential Science Indicators ; Essential Science Indicators ; IF < 5 ; IF < 5 ; JCR ; JCR ; National-Konsortium ; National-Konsortium ; Nationallizenz ; Nationallizenz ; SCOPUS ; SCOPUS ; Science Citation Index Expanded ; Science Citation Index Expanded ; Web of Science Core Collection ; Web of Science Core Collection

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