期刊
SPECTROSCOPY LETTERS
卷 54, 期 2, 页码 80-88出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00387010.2020.1850479
关键词
high-order harmonic generation; hydrogen molecular ion; internuclear distance effect; multiple ionization– acceleration– recombination; single-order harmonic enhancement
类别
资金
- Natural Science Foundation of Liaoning province, China [2019-MS-167]
The enhancement of a single-order harmonic in hydrogen molecular ion driven by a specific laser waveform is found to be dependent on the internuclear distance, with a smaller enhanced ratio at an equilibrium position of 2.0 a.u., disappearance at 7.0 a.u., and reappearance at distances larger than 8.0 a.u. The theoretical analyses suggest that the single-order harmonic arises not only from multiple acceleration-recombination processes, but also interference of different ionization-acceleration-recombination processes.
Generally, driven by a specific laser waveform, a single-order harmonic from the atomic harmonic spectrum can be enhanced, caused by the multiple acceleration-recombination processes. However, in this paper, we found that, driven by the same waveform, a single-order harmonic enhancement is dependent on the internuclear distance of the hydrogen molecular ion. Particularly, at the equilibrium position of 2.0 a.u., a single-order harmonic enhancement with the smaller enhanced ratio can be obtained. As the internuclear distance increases from 3.0 a.u. to 7.0 a.u., a single-order harmonic enhancement is disappeared. When the internuclear distance is larger than 8.0 a.u., a single-order harmonic with a higher enhanced ratio appears again. Further theoretical analyses show that, a single-order harmonic is produced not only from the multiple acceleration-recombination processes of the single ionization, but also coming from the interference of the different ionization-acceleration-recombination processes. According to this principle, we explain the internuclear distance dependent on a single-order harmonic enhancement of the hydrogen molecular ion.
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