Minimum structure of high-harmonic spectrafrom aligned O2 and N2 molecules

doi:10.1088/1674-1056/abfbd9

中国物理B ›› 2021, Vol. 30 ›› Issue (11): 114213-114213.doi: 10.1088/1674-1056/abfbd9

所属专题： SPECIAL TOPIC — Optical field manipulation

Minimum structure of high-harmonic spectrafrom aligned O₂ and N₂ molecules

Bo Yan(闫博)¹, Yi-Chen Wang(王一琛)¹, Qing-Hua Gao(高庆华)¹, Fang-Jing Cheng(程方晶)¹, Qiu-Shuang Jing(景秋霜)¹, Hong-Jing Liang(梁红静)^1,2,†, and Ri Ma(马日)^1,‡

1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
2 College of Science, Jilin Institute of Chemical Technology, Jilin 132022, China

收稿日期:2021-02-08 修回日期:2021-04-02 接受日期:2021-04-27 出版日期:2021-10-13 发布日期:2021-11-03
通讯作者: Hong-Jing Liang, Ri Ma E-mail:lianghj13@mails.jlu.edu.cn;rma@jlu.edu.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant No. 2019YFA0307700), the National Natural Science Foundation of China (Grant Nos. 91750104 and 11974137), and the Natural Science Foundation of Jilin Province, China (Grant No. YDZJ202101ZYTS157).

Minimum structure of high-harmonic spectrafrom aligned O₂ and N₂ molecules

Bo Yan(闫博)¹, Yi-Chen Wang(王一琛)¹, Qing-Hua Gao(高庆华)¹, Fang-Jing Cheng(程方晶)¹, Qiu-Shuang Jing(景秋霜)¹, Hong-Jing Liang(梁红静)^1,2,†, and Ri Ma(马日)^1,‡

1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
2 College of Science, Jilin Institute of Chemical Technology, Jilin 132022, China

Received:2021-02-08 Revised:2021-04-02 Accepted:2021-04-27 Online:2021-10-13 Published:2021-11-03
Contact: Hong-Jing Liang, Ri Ma E-mail:lianghj13@mails.jlu.edu.cn;rma@jlu.edu.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant No. 2019YFA0307700), the National Natural Science Foundation of China (Grant Nos. 91750104 and 11974137), and the Natural Science Foundation of Jilin Province, China (Grant No. YDZJ202101ZYTS157).

摘要/Abstract

摘要： We experimentally investigated the high-order harmonic generation (HHG) from aligned O₂ and N₂ molecules in a linearly polarized laser field, and presented the dependence of the harmonic spectrum on the driving laser intensity and molecular alignment angle. The minimum position of HHG of O₂ varies with changing the laser intensity, which is caused by multi-orbital interference. However, the location of the observed minimum structure in N₂ harmonic spectrum remained unchanged upon changing the laser intensity. The mechanism of the spectral minimum for N₂ case is regarded as a Cooper-like minimum in HHG associated with the molecular electronic structure. This work indicates that harmonic spectroscopy can effectively uncover information about molecular structure and electron dynamics.

关键词: high-order harmonic generation, aligned molecule, multi-orbital interference of molecules, Cooper-like minimum

Abstract: We experimentally investigated the high-order harmonic generation (HHG) from aligned O₂ and N₂ molecules in a linearly polarized laser field, and presented the dependence of the harmonic spectrum on the driving laser intensity and molecular alignment angle. The minimum position of HHG of O₂ varies with changing the laser intensity, which is caused by multi-orbital interference. However, the location of the observed minimum structure in N₂ harmonic spectrum remained unchanged upon changing the laser intensity. The mechanism of the spectral minimum for N₂ case is regarded as a Cooper-like minimum in HHG associated with the molecular electronic structure. This work indicates that harmonic spectroscopy can effectively uncover information about molecular structure and electron dynamics.

Key words: high-order harmonic generation, aligned molecule, multi-orbital interference of molecules, Cooper-like minimum

中图分类号: (Frequency conversion; harmonic generation, including higher-order harmonic generation)

42.65.Ky

33.20.Xx (Spectra induced by strong-field or attosecond laser irradiation) 33.80.Rv (Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))

Bo Yan(闫博), Yi-Chen Wang(王一琛), Qing-Hua Gao(高庆华), Fang-Jing Cheng(程方晶), Qiu-Shuang Jing(景秋霜), Hong-Jing Liang(梁红静), and Ri Ma(马日). Minimum structure of high-harmonic spectrafrom aligned O₂ and N₂ molecules[J]. 中国物理B, 2021, 30(11): 114213-114213.

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Minimum structure of high-harmonic spectrafrom aligned O₂ and N₂ molecules

Minimum structure of high-harmonic spectrafrom aligned O₂ and N₂ molecules

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