Modelling intensity volume averaging in ab initio calculations of high harmonic generation
Modelling intensity volume averaging in ab initio calculations of high harmonic generation
复制标题
高次谐波生成从头计算中的强度体积平均建模
DOI：
10.1088/1361-6455/acda6f
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Hutcheson L
中科院分区：
文献类型：
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作者：
Hutcheson L
我们提出了一种方法来评估宏观高次谐波产生（HHG）光谱中的单原子效应的生存，占焦点体积平均。我们应用这种技术的R-矩阵与时间相关（RMT）的研究，这是设计来包括一个原子的完整的多电子响应。这种方法允许评估扩散气体的实验测量的HHG光谱的哪些特征可以直接追踪到单原子效应，反之亦然。虽然占在焦点体积中的不同位置处产生的谐波的相位给出了最准确的结果，但发现使用较少数量的RMT计算的简化方法提供了可比的结论。我们应用这些方法来计算强度平均谐波谱在两个不同的实验制度。
We present an approach to assess the survival of single-atom effects in the macroscopic high-harmonic generation (HHG) spectrum, by accounting for focal volume averaging. We apply this technique to R-matrix with time-dependence (RMT) studies, which are designed to include the full multielectron response of an atom. Such an approach allows the assessment of which features of an experimentally-measured HHG spectrum of diffuse gases may be traced directly to single-atom effects and vice-versa. While accounting for the phase of harmonics produced at different locations in the focal volume gives the most accurate results, a simplified approach, using a smaller number of RMT calculations, is found to provide comparable conclusions. We apply these approaches to compute intensity-averaged harmonic spectra in two different experimental regimes.