H2+和D2+谐波强度与波长的关系

为了了解H₂+及其同位素分子谐波光谱效率与激光波长之间的关系，采用求解2维薛定谔方程的方法，理论研究了600nm~1600nm激光波长下H₂+和D₂+谐波光谱强度随波长的变化关系。结果表明，光谱强度随波长增大而减小；在短波长区间，H₂+光谱强度减小的倍率要大于D₂+，在长波长区间，H₂+光谱强度减小的倍率要小于D₂+；此外，在弱光强下，H₂+光谱强度总是大于D₂+, 在强光强下，H₂+光谱强度在短波长区间小于D₂+, 而其在长波长区间大于D₂+; 核间距延伸和电荷共振增强电离在H₂+和D₂+谐波光谱强度变化上起到主要作用。这一结果对分子谐波调控是有帮助的。

The relation of harmonic intensity between H2+ and D2+ with wavelength

In order to understand the relation between the harmonic spectra efficiency of H₂+ and its isotope molecule with laser wavelength, the relation between the harmonic intensity of H₂+ and D₂+ with the wavelength in the range of 600nm~1600nm was theoretically studied by solving 2-D time-dependent Schrdinger equation. It is shown that the intensity of harmonic spectrum is decreased as the wavelength increases. In shorter wavelength region, the decrease rate of harmonic intensity of H₂+ is greater than that of D₂+. In longer wavelength region, the decrease rate of harmonic intensity of H₂+ is smaller than that of D₂+. Furthermore, driven by lower laser intensity, the harmonic yield of H₂+ is always higher than that of D₂+. Driven by stronger laser intensity, the harmonic yield of H₂+ is lower than that of D₂+ in shorter wavelength region; while, it is higher than that of D₂+ in longer wavelength region. Theoretical analyses show that the extension of nuclear distance and charge resonance enhanced ionization play the important role in the change of harmonic yield of H₂+ and D₂+. The results are helpful for molecular harmonic control.