Strong-field approximation for harmonic generation in diatomic molecules

被引：101

作者：

Chirila, CC ^{[1
]}

Lein, M ^{[1
]}

机构：

[1] Max Planck Inst Nucl Phys, D-69117 Heidelberg, Germany

来源：

PHYSICAL REVIEW A | 2006年 / 73卷 / 02期

关键词：

D O I：

10.1103/PhysRevA.73.023410

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页数：10

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