Rotational dynamics of neutral O2 driven by linearly, elliptically and circularly polarized femtosecond pulsed lasers

doi:10.1088/1674-1056/adbeea

中国物理B ›› 2025, Vol. 34 ›› Issue (5): 53301-053301.doi: 10.1088/1674-1056/adbeea

Rotational dynamics of neutral O₂ driven by linearly, elliptically and circularly polarized femtosecond pulsed lasers

Ting Xu(许婷), Jin-Peng Ma(马金鹏), Xiao-Qing Hu(胡晓青)†, Yin-Song Tang(唐寅淞), Si-Qi Pei(裴思琪), Cong-Cong Jia(贾聪聪), Yong-Wu(吴勇), and Jian-Guo Wang(王建国)

National Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

收稿日期:2025-02-13 修回日期:2025-03-09 接受日期:2025-03-11 出版日期:2025-05-15 发布日期:2025-04-18
通讯作者: Xiao-Qing Hu E-mail:xiaoqing-hu@foxmail.com
基金资助:
Project supported by the National Key Research and Development Program of China (Grant No. 2022YFA1602502) and the National Natural Science Foundation of China (Grant No. 12450404).

Rotational dynamics of neutral O₂ driven by linearly, elliptically and circularly polarized femtosecond pulsed lasers

Ting Xu(许婷), Jin-Peng Ma(马金鹏), Xiao-Qing Hu(胡晓青)†, Yin-Song Tang(唐寅淞), Si-Qi Pei(裴思琪), Cong-Cong Jia(贾聪聪), Yong-Wu(吴勇), and Jian-Guo Wang(王建国)

National Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

Received:2025-02-13 Revised:2025-03-09 Accepted:2025-03-11 Online:2025-05-15 Published:2025-04-18
Contact: Xiao-Qing Hu E-mail:xiaoqing-hu@foxmail.com
Supported by:
Project supported by the National Key Research and Development Program of China (Grant No. 2022YFA1602502) and the National Natural Science Foundation of China (Grant No. 12450404).

摘要/Abstract

摘要： Rotational dynamics simulations of neutral O$_2$ molecules driven by linearly, elliptically and circularly polarized femtosecond pulsed lasers are carried out using a full quantum time-dependent wave packet evolution method. Here, the direction of laser propagation is set along the z axis, and the polarization plane is restricted to the xy plane. The results indicate that the alignment of O$_2$ molecules in the z direction is weakly affected by varying the ellipticity when the total laser intensity is held constant. For rotation within the xy plane, the linearly polarized laser significantly excites rotational motion, with the degree of excitation increasing as the ellipticity increases. In contrast, under the influence of a circularly polarized laser, the angular distribution of O$_2$ molecules in the xy plane remains isotropic. Additionally, the effects of the initial rotational quantum number, the temperature of the O$_2$ molecules and the nuclear spin on laser-induced alignment are discussed.

关键词: rotational dynamic, laser alignment, time-dependent wave packet simulation

Abstract: Rotational dynamics simulations of neutral O$_2$ molecules driven by linearly, elliptically and circularly polarized femtosecond pulsed lasers are carried out using a full quantum time-dependent wave packet evolution method. Here, the direction of laser propagation is set along the z axis, and the polarization plane is restricted to the xy plane. The results indicate that the alignment of O$_2$ molecules in the z direction is weakly affected by varying the ellipticity when the total laser intensity is held constant. For rotation within the xy plane, the linearly polarized laser significantly excites rotational motion, with the degree of excitation increasing as the ellipticity increases. In contrast, under the influence of a circularly polarized laser, the angular distribution of O$_2$ molecules in the xy plane remains isotropic. Additionally, the effects of the initial rotational quantum number, the temperature of the O$_2$ molecules and the nuclear spin on laser-induced alignment are discussed.

Key words: rotational dynamic, laser alignment, time-dependent wave packet simulation

中图分类号: (Rotation, vibration, and vibration-rotation constants)

33.15.Mt

33.20.Sn (Rotational analysis) 33.20.Wr (Vibronic, rovibronic, and rotation-electron-spin interactions)

Ting Xu(许婷), Jin-Peng Ma(马金鹏), Xiao-Qing Hu(胡晓青), Yin-Song Tang(唐寅淞), Si-Qi Pei(裴思琪), Cong-Cong Jia(贾聪聪), Yong-Wu(吴勇), and Jian-Guo Wang(王建国). Rotational dynamics of neutral O₂ driven by linearly, elliptically and circularly polarized femtosecond pulsed lasers[J]. 中国物理B, 2025, 34(5): 53301-053301.

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Rotational dynamics of neutral O₂ driven by linearly, elliptically and circularly polarized femtosecond pulsed lasers

Rotational dynamics of neutral O₂ driven by linearly, elliptically and circularly polarized femtosecond pulsed lasers

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