Excitation and ionization of OCS molecules in strong UV and NIR laser fields

doi:10.1088/1674-1056/ad3035

中国物理B ›› 2024, Vol. 33 ›› Issue (7): 73301-073301.doi: 10.1088/1674-1056/ad3035

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

收稿日期:2023-12-26 修回日期:2024-02-16 接受日期:2024-03-05 出版日期:2024-06-18 发布日期:2024-06-18
通讯作者: Hang Lv, Haifeng Xu E-mail:Lvhang0811@jlu.edu.cn;xuhf@jlu.edu.cn
基金资助:
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).

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

Received:2023-12-26 Revised:2024-02-16 Accepted:2024-03-05 Online:2024-06-18 Published:2024-06-18
Contact: Hang Lv, Haifeng Xu E-mail:Lvhang0811@jlu.edu.cn;xuhf@jlu.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: Rydberg state excitation, strong field, carbonyl sulfide, ionization

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.

Key words: Rydberg state excitation, strong field, carbonyl sulfide, ionization

中图分类号: (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))

33.80.Rv

34.80.Gs (Molecular excitation and ionization)

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[J]. 中国物理B, 2024, 33(7): 73301-073301.

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[J]. Chin. Phys. B, 2024, 33(7): 73301-073301.

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Excitation and ionization of OCS molecules in strong UV and NIR laser fields

Excitation and ionization of OCS molecules in strong UV and NIR laser fields

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