Laser phase effect on asymmetric harmonic distribution in H2+

doi:10.1088/1674-1056/26/4/044206

中国物理B ›› 2017, Vol. 26 ›› Issue (4): 44206-044206.doi: 10.1088/1674-1056/26/4/044206

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Laser phase effect on asymmetric harmonic distribution in H₂⁺

Li-Qiang Feng(冯立强), Wen-Liang Li(李文亮), Hui Liu(刘辉)

1 College of Science, Liaoning University of Technology, Jinzhou 121000, China;
2 State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
3 Key Laboratory at Universities of Education Department of Xinjiang Uygur Autonomous Region for New Energy Materials, Xinjiang Institute of Engineering, Urumqi 830091, China

收稿日期:2016-10-07 修回日期:2016-11-16 出版日期:2017-04-05 发布日期:2017-04-05
通讯作者: Li-Qiang Feng, Hui Liu E-mail:lqfeng_lngy@126.com,lqfeng@lnut.edu.cn;phys_lngy@126.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11504151), the Doctoral Scientific Research Foundation of Liaoning Province, China (Grant No. 201501123), and the Scientific Research Foundation of Liaoning Provincial Education Department, China (Grant No. L2014242).

Laser phase effect on asymmetric harmonic distribution in H₂⁺

Li-Qiang Feng(冯立强)^1,2, Wen-Liang Li(李文亮)^1,2,3, Hui Liu(刘辉)¹

1 College of Science, Liaoning University of Technology, Jinzhou 121000, China;
2 State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
3 Key Laboratory at Universities of Education Department of Xinjiang Uygur Autonomous Region for New Energy Materials, Xinjiang Institute of Engineering, Urumqi 830091, China

Received:2016-10-07 Revised:2016-11-16 Online:2017-04-05 Published:2017-04-05
Contact: Li-Qiang Feng, Hui Liu E-mail:lqfeng_lngy@126.com,lqfeng@lnut.edu.cn;phys_lngy@126.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11504151), the Doctoral Scientific Research Foundation of Liaoning Province, China (Grant No. 201501123), and the Scientific Research Foundation of Liaoning Provincial Education Department, China (Grant No. L2014242).

摘要/Abstract

摘要： The laser phase effect on the spatial distribution of the molecular high-order harmonic generation (MHHG) spectrum from H₂⁺ is theoretically investigated through solving the Non-Bohn-Oppenheimer (NBO) time-dependent Schrödinger equation (TDSE). The results are shown as follows. (i) The generated harmonics from the two nuclei each present an asymmetric distribution. Particularly, when the laser phases are chosen from 0.0π to 0.6π and from 1.7π to 2.0π, the contribution from the negative-H plays a main role in harmonic generation. When the laser phases are chosen from 0.7π to 1.6π, the contribution from the positive-H to the harmonic generation is remarkably enhanced and becomes greater than that from the negative-H. The electron localization, the time-frequency analyses of the harmonic spectrum and the time-dependent wave function are shown to explain the asymmetric harmonic distribution in H₂⁺, which provides us with a method to control the electron motion in molecules. (ii) As the pulse duration increases, the asymmetric distributions of the MHHG in two H nuclei decrease. (iii) Isotope investigation shows that the asymmetric harmonic distribution can be reduced by introducing the heavy nucleus (i.e., D₂⁺).

关键词: molecular high-order harmonic generation, spatial distribution of molecular harmonics, laser phase effect, isotope effect

Abstract: The laser phase effect on the spatial distribution of the molecular high-order harmonic generation (MHHG) spectrum from H₂⁺ is theoretically investigated through solving the Non-Bohn-Oppenheimer (NBO) time-dependent Schrödinger equation (TDSE). The results are shown as follows. (i) The generated harmonics from the two nuclei each present an asymmetric distribution. Particularly, when the laser phases are chosen from 0.0π to 0.6π and from 1.7π to 2.0π, the contribution from the negative-H plays a main role in harmonic generation. When the laser phases are chosen from 0.7π to 1.6π, the contribution from the positive-H to the harmonic generation is remarkably enhanced and becomes greater than that from the negative-H. The electron localization, the time-frequency analyses of the harmonic spectrum and the time-dependent wave function are shown to explain the asymmetric harmonic distribution in H₂⁺, which provides us with a method to control the electron motion in molecules. (ii) As the pulse duration increases, the asymmetric distributions of the MHHG in two H nuclei decrease. (iii) Isotope investigation shows that the asymmetric harmonic distribution can be reduced by introducing the heavy nucleus (i.e., D₂⁺).

Key words: molecular high-order harmonic generation, spatial distribution of molecular harmonics, laser phase effect, isotope effect

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

42.65.Ky

42.65.Re (Ultrafast processes; optical pulse generation and pulse compression) 32.80.Fb (Photoionization of atoms and ions)

冯立强, 李文亮, 刘辉. Laser phase effect on asymmetric harmonic distribution in H₂⁺[J]. 中国物理B, 2017, 26(4): 44206-044206.

Li-Qiang Feng(冯立强), Wen-Liang Li(李文亮), Hui Liu(刘辉). Laser phase effect on asymmetric harmonic distribution in H₂⁺[J]. Chin. Phys. B, 2017, 26(4): 44206-044206.

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Laser phase effect on asymmetric harmonic distribution in H₂⁺

Laser phase effect on asymmetric harmonic distribution in H₂⁺

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