Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields

doi:10.1088/1674-1056/27/6/063301

中国物理B ›› 2018, Vol. 27 ›› Issue (6): 63301-063301.doi: 10.1088/1674-1056/27/6/063301

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇下一篇

Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields

Wan-Long Zuo(左万龙), Hang Lv(吕航), Hong-Jing Liang(梁红静), Shi-Min Shan(单石敏), Ri Ma(马日), Bing Yan(闫冰), Hai-Feng Xu(徐海峰)

1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
2 Anhui Provincial Key Laboratory of Optoelectric Materials Science and Technology, Anhui Normal University, Wuhu 241000, China

收稿日期:2018-02-04 修回日期:2018-03-13 出版日期:2018-06-05 发布日期:2018-06-05
通讯作者: Ri Ma, Hai-Feng Xu E-mail:rma@jlu.edu.cn;xuhf@jlu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos.91750104,11704004,11704149,and 11474130) and the Natural Science Foundation of Jilin Province,China (Grant No.20180101289JC).

Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields

Wan-Long Zuo(左万龙)^1,2, Hang Lv(吕航)¹, Hong-Jing Liang(梁红静)¹, Shi-Min Shan(单石敏)¹, Ri Ma(马日)¹, Bing Yan(闫冰)¹, Hai-Feng Xu(徐海峰)¹

1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
2 Anhui Provincial Key Laboratory of Optoelectric Materials Science and Technology, Anhui Normal University, Wuhu 241000, China

Received:2018-02-04 Revised:2018-03-13 Online:2018-06-05 Published:2018-06-05
Contact: Ri Ma, Hai-Feng Xu E-mail:rma@jlu.edu.cn;xuhf@jlu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos.91750104,11704004,11704149,and 11474130) and the Natural Science Foundation of Jilin Province,China (Grant No.20180101289JC).

摘要/Abstract

摘要：

By using a heated molecular beam in combination with a time-of-flight mass spectrometer, we experimentally study the ionization of vibrational-hot carbon disulfide (CS₂) molecules irradiated by a linearly polarized 800-nm 50-fs strong laser field. The ion yields are measured in a laser intensity range of 7.0×10¹² W/cm²-1.5×10¹⁴ W/cm² at different molecular temperatures of up to 1400 K. Enhanced ionization yield is observed for vibrationally excited CS₂ molecules. The results show that the enhancement decreases as the laser intensity increases, and exhibits non-monotonical dependence on the molecular temperature. According to the calculated potential energy curves of the neutral and ionic electronic states of CS₂, as well as the theoretical models of molecular strong-field ionization available in the literature, we discuss the mechanism of the enhanced ionization of vibrational-hot molecules. It is indicated that the enhanced ionization could be attributed to both the reduced ionization potential with vibrational excitation and the Frank-Condon factors between the neutral and ionic electronic states. Our study paves the way to understanding the effect of nuclear motion on the strong-field ionization of molecules, which would give a further insight into theoretical and experimental investigations on the interaction of polyatomic molecules with strong laser fields.

关键词: strong field ionization, vibrational excited, time-of-flight-mass spectrum

Abstract:

Key words: strong field ionization, vibrational excited, time-of-flight-mass spectrum

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

33.80.Rv

左万龙, 吕航, 梁红静, 单石敏, 马日, 闫冰, 徐海峰. Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields[J]. 中国物理B, 2018, 27(6): 63301-063301.

Wan-Long Zuo(左万龙), Hang Lv(吕航), Hong-Jing Liang(梁红静), Shi-Min Shan(单石敏), Ri Ma(马日), Bing Yan(闫冰), Hai-Feng Xu(徐海峰). Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields[J]. Chin. Phys. B, 2018, 27(6): 63301-063301.

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Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields

Enhanced ionization of vibrational hot carbon disulfide molecules in strong femtosecond laser fields

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