High-order harmonic generation by a hydrogen molecular ion in a strong laser field is theoretically considered within the frames of a two-level model. Franck-Condon factors for ionization of a neutral hydrogen molecule are derived taking into account the laser field. Nuclear dynamics of a hydrogen molecular ion in a laser pulse is investigated within the frames of classical mechanics. Harmonic spectrum contains a lot of noninteger harmonics of laser frequency. This is explained by the effective Rabi transitions between the even and odd electronic levels. The extended plateau and the sharp cutoff in the harmonic spectrum has been found. The height of the plateau and the cutoff increase with laser intensity.
|Original language||English (US)|
|Number of pages||1|
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|State||Published - Jan 1 2000|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics