Electron recollisional excitation of OCS$^+$ in phase-locked $ω+ 2ω$ intense laser fields
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arXiv
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| Natura: | Preprint |
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2024
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| _version_ | 1866910024043855872 |
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| author | Endo, Tomoyuki Otobe, Tomohito Itakura, Ryuji |
| author_facet | Endo, Tomoyuki Otobe, Tomohito Itakura, Ryuji |
| contents | Photoelectron-photoion coincidence momentum imaging has been performed to investigate excitation processes on dissociative ionization of OCS, OCS $\to$ OCS$^+$ + e$^-$ $\to$ OC + S$^+$ + e$^-$, in phase-locked $ω+ 2ω$ intense laser fields. The electron kinetic energy spectra depend on coincidentally produced ion species, OCS$^+$ or S$^+$. The observed electron momentum distribution shows clear asymmetry along the laser polarization direction with a 2$π$-oscillation period as a function of the phase difference between the $ω$ and $2ω$ laser fields. The asymmetry of electron emission in the OCS$^+$ channel flips at the electron kinetic energy of 8.2 eV where the dominant scattering direction switches from forward to backward. In the S$^+$ channel, the asymmetry flips at the lower kinetic energy of 4.2 eV. In comparison with a classical trajectory Monte Carlo simulation, it has been clarified that this energy shift between the OCS$^+$ and S$^+$ channels corresponds to the excitation energy of the parent ion and that electron recollisional excitation takes place to form the fragment ion in intense laser fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_14148 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electron recollisional excitation of OCS$^+$ in phase-locked $ω+ 2ω$ intense laser fields Endo, Tomoyuki Otobe, Tomohito Itakura, Ryuji Atomic Physics Chemical Physics Photoelectron-photoion coincidence momentum imaging has been performed to investigate excitation processes on dissociative ionization of OCS, OCS $\to$ OCS$^+$ + e$^-$ $\to$ OC + S$^+$ + e$^-$, in phase-locked $ω+ 2ω$ intense laser fields. The electron kinetic energy spectra depend on coincidentally produced ion species, OCS$^+$ or S$^+$. The observed electron momentum distribution shows clear asymmetry along the laser polarization direction with a 2$π$-oscillation period as a function of the phase difference between the $ω$ and $2ω$ laser fields. The asymmetry of electron emission in the OCS$^+$ channel flips at the electron kinetic energy of 8.2 eV where the dominant scattering direction switches from forward to backward. In the S$^+$ channel, the asymmetry flips at the lower kinetic energy of 4.2 eV. In comparison with a classical trajectory Monte Carlo simulation, it has been clarified that this energy shift between the OCS$^+$ and S$^+$ channels corresponds to the excitation energy of the parent ion and that electron recollisional excitation takes place to form the fragment ion in intense laser fields. |
| title | Electron recollisional excitation of OCS$^+$ in phase-locked $ω+ 2ω$ intense laser fields |
| topic | Atomic Physics Chemical Physics |
| url | https://arxiv.org/abs/2408.14148 |