多通道和多极效应对氩高次谐波谱中Cooper极小值的影响
The Impact of Multichannel and Multipole Effects on the Cooper Minimum in the High-Harmonics Spectrum of Argon
摘要：
我们研究了高次谐波产生过程中多轨道和多极效应的相关性。采用含时组态相互作用单重态（TDCIS）方法研究了剩余电子-离子相互作用的详细描述对高次谐波谱的影响。我们发现，无论是否考虑到通道间的相互作用，库珀最小值的形状和位置的氩的高次谐波谱显着变化。在30-50 eV的能量区域中，HHG产率可以被低估多达2个数量级。我们发现，低电离概率的论点是不足以证明忽略多轨道的贡献。此外，我们还发现高次谐波产额对电子-离子相互作用的非球形多极特性很敏感。
英文摘要：
We investigate the relevance of multiple-orbital and multipole effects during high-harmonic generation (HHG). The time-dependent configuration-interaction singles (TDCIS) approach is used to study the impact of the detailed description of the residual electron-ion interaction on the HHG spectrum. We find that the shape and position of the Cooper minimum in the HHG spectrum of argon changes significantly whether or not interchannel interactions are taken into account. The HHG yield can be underestimated by up to 2 orders of magnitude in the energy regio of 30-50 eV. We show that the argument of low ionization probability is not sufficient to justify ignoring multiple-orbital contributions. Additionally, we find the HHG yield is sensitive to the nonspherical multipole character of the electron-ion interaction.
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