从不同取向的高次谐波谱的交叉点读取分子信息
Reading molecular messages from the intersections of high-order harmonic spectra at different orientations
摘要：
用数值计算和解析方法研究了强激光场辐照下不同核间距的H $_2^+$的高次谐波产生与取向的关系。计算的分子HHG光谱被发现是敏感的分子轴取向相对于入射激光场偏振和核间距。特别是，不同的取向角计算的光谱表现出一种交叉，这被确定为由于在HHG分子内的两个中心的干扰而产生。这种引人注目的“相交”现象可以用来探测分子的瞬时结构。
英文摘要：
We investigate the orientation dependence of high-order harmonic generation (HHG) from H$_2^+$ with different internuclear distances irradiated by intense laser fields both numerically and analytically. The calculated molecular HHG spectra are found to be sensitive to molecular axis orientation relative to incident laser field polarization and internuclear separation. In particular, the spectra calculated for different orientation angles demonstrate a kind of intersection, which is identified as arising due to intramolecular two-center interference in the HHG. The striking "intersection" phenomenon can be used to probe the molecular instantaneous structure.
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