摘要
本文理论研究了在特定激光波形下H_(2)^(+)核间距对单阶谐波增强的影响.研究结果表明,当特定激光波形驱动原子时,谐波光谱可以呈现单阶谐波强度增强;但是,当用相同激光波形驱动H_(2)^(+)时,单阶谐波强度增强的现象与H_(2)^(+)核间距离有关.具体来说,当H_(2)^(+)在平衡位置时,H_(2)^(+)谐波光谱呈现单阶谐波增强现象;当H_(2)^(+)核间距在3~7 a.u.变化时,单阶谐波增强现象消失;当H_(2)^(+)核间距大于8 a.u.时,单阶谐波增强会再次出现.理论分析表明,多通道谐波干涉是导致H_(2)^(+)单阶谐波强度变化的原因.
The effect of internuclear distance of H_(2)^(+) on the single-order harmonic enhancement driven by the specific laser waveform has been studied theoretically.The results show that when the atom is driven by the specific laser waveform,the single-order harmonic enhancement can be found on the harmonic spectrum.However,when H_(2)^(+) is driven by the same waveform,the single-order harmonic enhancement is related to the internuclear distance of H_(2)^(+).Particularly,when H_(2)^(+) is at its equilibrium position,the single-order harmonic enhancement can be found on the harmonic spectrum.When the internuclear distance of H_(2)^(+) changes from 3 a.u.to 7 a.u.,the single-order harmonic enhancement disappears.When the internuclear distance of H_(2)^(+) is greater than 8 a.u.,the single-order harmonic enhancement will reappear.Theoretical analyses show that the multichannel harmonic interference is responsible for the change of the single-order harmonic intensity.
作者
徐翠艳
冯立强
XU Cui-Yan;FENG Li-Qiang(College of Science,Liaoning University of Technology,Jinzhou 121001,China)
出处
《四川大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第3期123-126,共4页
Journal of Sichuan University(Natural Science Edition)
基金
辽宁省自然科学基金面上项目(2019-MS-167)
辽宁省教育厅青年项目(LJKQZ2021138)。
关键词
高次谐波
核间距
单阶谐波强度
多通道谐波干涉
High-order harmonic generation
Internuclear distance
Single-order harmonic intensity
Multichannel harmonic interference
