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

作　　者：师慧军 刘洋 孙添 吕航 徐海峰 Huijun Shi;Yang Liu;Tian Sun;Hang Lv;and Haifeng Xu(Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China)

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China

出　　处：《Chinese Physics B》2024年第7期285-291,共7页中国物理B（英文版）

基　　金：Project supported by the National Key Program for S&T Research and Development(Grant No.2019YFA0307700);the National Natural Science Foundation of China(Grant Nos.12174148,11874179,12074144,and 12074146)。

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 triatomic 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 

分 类 号：O562.4[理学—原子与分子物理]