TY  - EJOUR
AU  - Karamatskos, Evangelos T.
AU  - Yarlagadda, Suresh
AU  - Patchkovskii, Serguei
AU  - Vrakking, Marc J. J.
AU  - Welsch, Ralph
AU  - Küpper, Jochen
AU  - Rouzée, Arnaud
TI  - Time-resolving the UV-initiated photodissociation dynamics of OCS
M1  - PUBDB-2021-02517
SP  - 1-25
PY  - 2021
N1  - 25 pages, 5 figures
AB  - We present a time-resolved study of the photodissociation dynamics of OCS after UV-photoexcitation at λ = 237 nm. OCS molecules (X <sup>1</sup>Σ<sup>+</sup>) were primarily excited to the 1 <sup>1</sup>A" and the 2 <sup>1</sup>A′ Renner-Teller components of the <sup>1</sup>Σ<sup>−</sup> and <sup>1</sup>∆ 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<sup>+</sup> and S<sup>+</sup> fragments by intense 790 nm laser pulses. Surprisingly, fast oscillations with a period of  ∼ 100 fs were observed in the S<sup>+</sup> 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 <sup>1</sup>Σ<sup>+</sup>,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 <sup>3</sup>A" or 2 <sup>1</sup>A" states of the molecule that predissociate to form S(<sup>3</sup>P<sub>J</sub>) photoproducts.
LB  - PUB:(DE-HGF)25
DO  - DOI:10.3204/PUBDB-2021-02517
UR  - https://bib-pubdb1.desy.de/record/459256
ER  -