Strong-field approximation for harmonic generation in diatomic molecules

Chirila, Ciprian C.; Lein, Manfred

doi:10.1103/PhysRevA.73.023410

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Strong-field approximation for harmonic generation in diatomic molecules

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Chirila, Ciprian C.
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Lein, Manfred
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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http://link.aps.org/doi/10.1103/PhysRevA.73.023410
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Chirila, C. C., & Lein, M. (2006). Strong-field approximation for harmonic generation in diatomic molecules. Physical Review A, 73(2): 023410. doi:10.1103/PhysRevA.73.023410.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-80A5-E

Abstract

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.