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Post-Ionization Dynamics of the Polar Molecule OCS in Asymmetric Laser Fields

Endo T, Ziems KM, Richter M, Froebel FG, Hishikawa A, Gräfe S, Legare F, Ibrahim H (2022)

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Publication Type: Journal article

Publication year: 2022

Journal

Book Volume: 10

Article Number: 859750

DOI: 10.3389/fchem.2022.859750

Abstract

We have investigated the dissociation mechanisms of the prototypical heavy polar molecule OCS into the two break-up channels of the dication, OCS²⁺ → O⁺ + CS⁺ and OC⁺ + S⁺, in phase-locked two-color intense laser fields. The branching ratio of the breaking of the C–O and C–S bonds followed a pronounced 2π-oscillation with a modulation depth of 11%, depending on the relative phase of the two-color laser fields. The fragment ejection direction of both break-up channels reflects the anisotropy of the tunneling ionization rate, following a 2π-periodicity, as well. The two dissociation pathways in the C–S bond breaking channel show different phase dependencies of the fragment ejection direction, which are assigned to post-ionization dynamics. These observations, resulting from the excitation with asymmetric two-color intense laser fields, supported by state-of-the-art theoretical simulations, reveal the importance of post-ionization population dynamics in addition to tunneling ionization in the molecular fragmentation processes, even for heavy polar molecules.

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How to cite

APA:

Endo, T., Ziems, K.M., Richter, M., Froebel, F.G., Hishikawa, A., Gräfe, S.,... Ibrahim, H. (2022). Post-Ionization Dynamics of the Polar Molecule OCS in Asymmetric Laser Fields. Frontiers in Chemistry, 10. https://doi.org/10.3389/fchem.2022.859750

MLA:

Endo, Tomoyuki, et al. "Post-Ionization Dynamics of the Polar Molecule OCS in Asymmetric Laser Fields." Frontiers in Chemistry 10 (2022).

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