Theoretical study of the odd–even-order harmonic generation for asymmetric ions in non-Born–Oppenheimer approximation

doi:10.1088/1674-1056/26/7/074215

Abstract We calculated the harmonic spectra generated from the asymmetric molecules of HD⁺ and HeH²⁺. It is found that HD⁺produces only odd harmonics, while HeH²⁺ produces both odd and even harmonics. Further analysis reveals that for both HD⁺ and HeH²⁺, the nuclear dipole acceleration can generate even harmonics, but it is three orders of magnitude lower than that of the electron. Hence, the electronic dipole acceleration dominates the harmonic generation. For HD⁺, the electronic dipole acceleration only contributes to the generation of odd harmonics, but for HeH²⁺ it contributes to the generation of both odd and even harmonics. Besides, one concept of the broken degree of system-symmetry is proposed to explain the different odd-even property between the harmonic spectra of HD⁺ and HeH²⁺.

Keywords: strong field physics odd–even-order harmonic dipole acceleration asymmetric ions

Received: 12 December 2016
Revised: 14 February 2017
Accepted manuscript online:

PACS:	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	42.50.Hz	(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.11404153,11135002,11475076,and 11405077) and the Fundamental Research Funds for the Central Universities of China (Grants Nos.lzujbky-2016-29,lzujbky-2016-31,and lzujbky-2016-209).

Corresponding Authors: Hong-Chuan Du, Bi-Tao Hu
E-mail: duhch@lzu.edu.cn;hubt@lzu.edu.cn

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Sheng-Jun Yue(岳生俊), Hong-Chuan Du(杜洪川), Hong-Mei Wu(吴红梅), Shan Xue(薛山), Jia-Chen Zhao(赵家琛), Bi-Tao Hu(胡碧涛) Theoretical study of the odd–even-order harmonic generation for asymmetric ions in non-Born–Oppenheimer approximation 2017 Chin. Phys. B 26 074215

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Theoretical study of the odd–even-order harmonic generation for asymmetric ions in non-Born–Oppenheimer approximation

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