H2+核间距对单阶谐波增强的影响

Internuclear distance effect of H2+ on the single-order harmonic enhancement

摘要:

本文理论研究了在特定激光波形下, H2+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H2+时, 单阶谐波强度增强的现象与H2+核间距离有关. 具体来说, 当H2+在平衡位置时, H2+谐波光谱呈现单阶谐波增强现象; 当H2+核间距在3~7 a.u.变化时, 单阶谐波增强现象消失; 当H2+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H2+单阶谐波强度变化的原因.

Abstract:

The effect of internuclear distance of H2+ 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 H2+ is driven by the same waveform, the single-order harmonic enhancement is related to the internuclear distance of H2+. Particularly, when H2+ is at its equilibrium position, the single-order harmonic enhancement can be found on the harmonic spectrum. When the internuclear distance of H2+ changes from 3 a.u. to 7 a.u., the single-order harmonic enhancement disappears. When the internuclear distance of H2+ 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.