Strong-field approximation for harmonic generation in diatomic molecules

Details Strong-field approximation for harmonic generation in diatomic molecules Strong-field approximation for harmonic generation in diatomic molecules

2005-10-27

arxiv.org/abs/physics/0510246v1

Physics

Atomic Physics

24 pages, 7 figures

Scientific paper

10.1103/PhysRevA.73.023410

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 the length gauge. At large internuclear separations, we compare the resulting cutoffs with the predictions of the simple-man's model. Good agreement is obtained only by using the adapted saddle-point method combined with the velocity gauge.

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