Strong-field approximation for harmonic generation in diatomic molecules
Strong-field approximation for harmonic generation in diatomic molecules
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DOI：
10.1103/physreva.73.023410
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发表时间：
2006-02-01
影响因子：
2.9
通讯作者：
Lein, M
中科院分区：
文献类型：
--
作者：
Chirila, CC;Lein, M
在强场近似下研究了双原子分子中高次谐波的产生。我们表明，传统的鞍点近似是不适合大的核间距。提出了一种考虑分子结构的自适应鞍点法。我们分析了速度和长度计的谐波产生谱的预测。在大的核间分离，我们比较由此产生的截止与三步半经典机制的预测。只有使用适应鞍点法结合速度计，才能获得良好的一致性。
The generation of high-order harmonics in diatomic molecules is investigated within the framework of the strong-field approximation. We show that the conventional saddle-point approximation is not suitable for large internuclear distances. An adapted saddle-point method that takes into account the molecular structure is presented. We analyze the predictions for the harmonic-generation spectra in both the velocity and length gauges. At large internuclear separations, we compare the resulting cutoffs with the predictions of the three-step semiclassical mechanism. Good agreement is obtained only by using the adapted saddle-point method combined with the velocity gauge.