Post-Ionization Dynamics of the Polar Molecule OCS in Asymmetric Laser Fields
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 pronoun...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-04-01
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| Series: | Frontiers in Chemistry |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fchem.2022.859750/full |
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| author | Tomoyuki Endo Tomoyuki Endo Karl Michael Ziems Karl Michael Ziems Martin Richter Friedrich G. Fröbel Akiyoshi Hishikawa Akiyoshi Hishikawa Stefanie Gräfe Stefanie Gräfe François Légaré Heide Ibrahim |
| author_facet | Tomoyuki Endo Tomoyuki Endo Karl Michael Ziems Karl Michael Ziems Martin Richter Friedrich G. Fröbel Akiyoshi Hishikawa Akiyoshi Hishikawa Stefanie Gräfe Stefanie Gräfe François Légaré Heide Ibrahim |
| author_sort | Tomoyuki Endo |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-21T10:28:37Z |
| format | Article |
| id | doaj.art-d5e03d14fe3d410bbaf9930b3fc69550 |
| institution | Directory Open Access Journal |
| issn | 2296-2646 |
| language | English |
| last_indexed | 2024-12-21T10:28:37Z |
| publishDate | 2022-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Chemistry |
| spelling | doaj.art-d5e03d14fe3d410bbaf9930b3fc695502022-12-21T19:07:15ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462022-04-011010.3389/fchem.2022.859750859750Post-Ionization Dynamics of the Polar Molecule OCS in Asymmetric Laser FieldsTomoyuki Endo0Tomoyuki Endo1Karl Michael Ziems2Karl Michael Ziems3Martin Richter4Friedrich G. Fröbel5Akiyoshi Hishikawa6Akiyoshi Hishikawa7Stefanie Gräfe8Stefanie Gräfe9François Légaré10Heide Ibrahim11Institut national de la recherche scientifique, Centre Énergie Matériaux et Télécommunications, Varennes, QC, CanadaKansai Photon Science Institute, National Institutes for Quantum Science and Technology, Kizugawa, JapanInstitute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Jena, GermanyMax Planck School of Photonics, Jena, GermanyInstitute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Jena, GermanyInstitute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Jena, GermanyDepartment of Chemistry, Graduate School of Science, Nagoya University, Nagoya, JapanResearch Center for Materials Science, Nagoya University, Nagoya, JapanInstitute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Jena, GermanyMax Planck School of Photonics, Jena, GermanyInstitut national de la recherche scientifique, Centre Énergie Matériaux et Télécommunications, Varennes, QC, CanadaInstitut national de la recherche scientifique, Centre Énergie Matériaux et Télécommunications, Varennes, QC, CanadaWe 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.https://www.frontiersin.org/articles/10.3389/fchem.2022.859750/fulltwo-color laser fieldcoherent control experimentpost-ionization dynamicsreal-time real-space time-dependent density functional theoryCoulomb explosion imaging |
| spellingShingle | Tomoyuki Endo Tomoyuki Endo Karl Michael Ziems Karl Michael Ziems Martin Richter Friedrich G. Fröbel Akiyoshi Hishikawa Akiyoshi Hishikawa Stefanie Gräfe Stefanie Gräfe François Légaré Heide Ibrahim Post-Ionization Dynamics of the Polar Molecule OCS in Asymmetric Laser Fields Frontiers in Chemistry two-color laser field coherent control experiment post-ionization dynamics real-time real-space time-dependent density functional theory Coulomb explosion imaging |
| title | Post-Ionization Dynamics of the Polar Molecule OCS in Asymmetric Laser Fields |
| title_full | Post-Ionization Dynamics of the Polar Molecule OCS in Asymmetric Laser Fields |
| title_fullStr | Post-Ionization Dynamics of the Polar Molecule OCS in Asymmetric Laser Fields |
| title_full_unstemmed | Post-Ionization Dynamics of the Polar Molecule OCS in Asymmetric Laser Fields |
| title_short | Post-Ionization Dynamics of the Polar Molecule OCS in Asymmetric Laser Fields |
| title_sort | post ionization dynamics of the polar molecule ocs in asymmetric laser fields |
| topic | two-color laser field coherent control experiment post-ionization dynamics real-time real-space time-dependent density functional theory Coulomb explosion imaging |
| url | https://www.frontiersin.org/articles/10.3389/fchem.2022.859750/full |
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