Laser phase effect on asymmetric harmonic distribution in H2+

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

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⁺).

Keywords: molecular high-order harmonic generation spatial distribution of molecular harmonics laser phase effect isotope effect

Received: 07 October 2016
Revised: 16 November 2016
Accepted manuscript online:

PACS:	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)
	32.80.Fb	(Photoionization of atoms and ions)

Fund: 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).

Corresponding Authors: Li-Qiang Feng, Hui Liu
E-mail: lqfeng_lngy@126.com,lqfeng@lnut.edu.cn;phys_lngy@126.com

Cite this article:

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⁺ 2017 Chin. Phys. B 26 044206

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Laser phase effect on asymmetric harmonic distribution in H₂⁺