%0 Journal Article
%A Karamatskos, Evangelos
%A Yarlagadda, Suresh
%A Patchkovskii, Serguei
%A Vrakking, Marc
%A Welsch, Ralph
%A Küpper, Jochen
%A Rouzée, Arnaud
%T Time-resolving the UV-initiated photodissociation dynamics of OCS
%J Faraday discussions
%V 228
%@ 1364-5498
%C Cambridge [u.a.]
%I Soc.
%M PUBDB-2020-04146
%P 413 - 431
%D 2020
%Z 25 pages, 5 figures
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 33570531
%U <Go to ISI:>//WOS:000664793300020
%R 10.1039/D0FD00119H
%U https://bib-pubdb1.desy.de/record/450054