Analysis of recombination in high-order harmonic generation in molecules
B. ZimmermannMax Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, GermanyManfred LeinMax Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, GermanyJan M. RostMax Planck Institute for the Physics of Complex Systems, Nöthnitzer Straße 38, 01187 Dresden, Germany
2005en
ABI
Abstract
We show that the dependence of high-order harmonic generation (HHG) on the molecular orientation can be understood within a theoretical treatment that does not involve the strong field of the laser. The results for ${\mathrm{H}}_{2}$ show excellent agreement with time-dependent strong-field calculations for model molecules, and this motivates a prediction for the orientation dependence of HHG from the ${\mathrm{N}}_{2}$ $3{\ensuremath{\sigma}}_{g}$ valence orbital. For both molecules, we find that the polarization of recombination photons is influenced by the molecular orientation. The variations are particularly pronounced for the ${\mathrm{N}}_{2}$ valence orbital, which can be explained by the presence of atomic $p$ orbitals.
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