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Excitation and ionization of OCS molecules in strong UV and NIR laser fields |
| Huijun Shi(师慧军), Yang Liu(刘洋), Tian Sun(孙添), Hang Lv(吕航)†, and Haifeng Xu(徐海峰)‡ |
| Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China |
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Abstract Rydberg state excitation (RSE) is a highly non-linear physical phenomenon that is induced by the ionization of atoms or molecules in strong femtosecond laser fields. Here we observe that both parent and fragments (S, C, OC) of the tri-atomic molecule carbonyl sulfide (OCS) can survive strong 800 nm or 400 nm laser fields in high Rydberg states. The dependence of parent and fragment RSE yields on laser intensity and ellipticity is investigated in both laser fields, and the results are compared with those for strong-field ionization. Distinctly different tendencies for laser intensity and ellipticity are observed for fragment RSE compared with the corresponding ions. The mechanisms of RSE and strong-field ionization of OCS molecules in different laser fields are discussed based on the experimental results. Our study sheds some light on the strong-field excitation and ionization of molecules irradiated by femtosecond NIR and UV laser fields.
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Received: 26 December 2023
Revised: 16 February 2024
Accepted manuscript online: 05 March 2024
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PACS:
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33.80.Rv
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(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))
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34.80.Gs
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(Molecular excitation and ionization)
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| Fund: Project supported by the National Key Program for S&T Research and Development (Grant No. 2019YFA0307700) and the National Natural Science Foundation of China (Grant Nos. 12174148, 11874179, 12074144, and 12074146). |
Corresponding Authors:
Hang Lv, Haifeng Xu
E-mail: Lvhang0811@jlu.edu.cn;xuhf@jlu.edu.cn
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Cite this article:
Huijun Shi(师慧军), Yang Liu(刘洋), Tian Sun(孙添), Hang Lv(吕航), and Haifeng Xu(徐海峰) Excitation and ionization of OCS molecules in strong UV and NIR laser fields 2024 Chin. Phys. B 33 073301
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