Journal Article

PUBDB-2020-04146

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Time-resolving the UV-initiated photodissociation dynamics of OCS

Karamatskos, E.CFEL* ; Yarlagadda, S.CFEL* ; Patchkovskii, S. ; Vrakking, M.Extern* ; Welsch, R.CFEL*Extern* ; Küpper, J. (Corresponding author)CFEL*DESY* ; Rouzée, A. (Corresponding author)Extern*

2020
Soc. Cambridge [u.a.]

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Please use a persistent id in citations: doi:10.1039/D0FD00119H

Abstract: We present a time-resolved study of the photodissociation dynamics of OCS after UV- photoexcitation at λ = 237 nm. OCS molecules (X 1Σ+) were primarily excited to the 1 1A′′ and the 2 1A′ Renner-Teller components of the 1Σ− and 1∆ states. Dissociation into CO and S fragments was observed through time-delayed strong-field ionisation and imaging of the kinetic energy of the resulting CO+ and S+ fragments by intense 790 nm laser pulses. Surprisingly, fast oscillations with a period of ∼100 fs were observed in the S+ channel of the UV dissociation. Based on wavepacket-dynamics simulations coupled with a simple electrostatic-interaction model, these oscillations do not correspond to the known highly-excited rotational motion of the leaving CO(X 1Σ+, J ≫ 0) fragments, which has a timescale of ∼140 fs. Instead, we suggest to assign the observed oscillations to the excitation of vibrational wavepackets in the 2 3A′′ or 2 1A′′ states of the molecule that predissociate to form S(3PJ ) photoproducts.

Note: 25 pages, 5 figures

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Contributing Institute(s):

1. FS-CFEL-3 (CFEL-DESYT)
2. CFEL-Theory (FS-CFEL-3)
3. FS-CFEL-1 (Group Leader: Henry Chapman) (CFEL-I)
4. CFEL-CMI (FS-CFEL-CMI)
5. Uni Hamburg / Experimentalphysik (UNI/EXP)

Research Program(s):

1. 6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621) (POF3-621)
2. AIM - CUI: Advanced Imaging of Matter (390715994) (390715994)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2020

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Database coverage:
; Allianz-Lizenz / DFG ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Karamatskos, E. T.CFEL*DESY* ; Yarlagadda, S.CFEL* ; Patchkovskii, S. ; Vrakking, M. J. J.Extern* ; Welsch, R.Extern*DESY* ; Küpper, J. (Corresponding author)CFEL*XFEL.EU*DESY* ; Rouzée, A. (Corresponding author)Extern*XFEL.EU*
Time-resolving the UV-initiated photodissociation dynamics of OCS
1-25 (2021) [10.3204/PUBDB-2021-02517]2021     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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