Coulomb effect on the dynamics of atoms in a strong elliptical laser field: Unification of the excitation and ionization

摘要

We investigate the Coulomb effect on the dynamics of atoms in a strong elliptical laser field by solving the three-dimensional time-dependent Schr?dinger equation with and without the photoelectron core Coulomb interactions and find that the Coulomb effect plays an important role for the excitation and ionization processes, while it is less important for the high-order harmonic generation. Our calculation results can serve as a benchmark for other approximative methods. Looking at the photoelectron momentum distribution, we find that the Coulomb effect is important for the momentum distribution in the polarization plane and less important for the momentum distributions along the normal direction perpendicular to the polarization plane. Similar to the photoabsorption in a weak field, we demonstrate that the excitation and ionization can be treated in a unified way, which implies the low-energy photoelectron distributions can be connected with the populations of highly excited states.