Potential energy surfaces for electron dynamics from a model of localized Gaussian wave packets with valence-bond spin-coupling: high-harmonic generation spectra from H and He atoms

Abstract

Potential energy surfaces of electron dynamics (ePES) are constructed from a model of localized electron wave packets (eWP) with non-orthogonal valence-bond (VB) spin coupling and applied to quantum dynamics simulations of high harmonic generation (HHG) spectra of hydrogen and helium atoms induced by intense laser pulses. The dynamics of the single electron on the ePES is calculated by numerically solving the time-dependent Schrodinger equation. The results reasonably reproduce previous studies. The dynamics of the electron wave function, dipole moment and dipole acceleration were analyzed by comparing one- and two-dimensional calculations. It was found that the main part of the wave function remains within a few Bohrs of the nuclear position, while the part of the wave function that is several orders of magnitude smaller in probability density, which escapes the laser-induced potential barrier by quantum tunneling effect, mainly contributes to the HHG.

9 pages, 12 figures

References in corpus (4)

• Extreme ultraviolet frequency comb metrology
• Self-probing of Molecules with High Harmonic Generation
• Time-dependent multiconfiguration self-consistent-field method based on occupation restricted multiple active space model for multielectron dynamics in intense laser fields
• Time-dependent second Born calculations for model atoms and molecules in strong laser fields