Abstract
By numerically solving the time-dependent Schr\"odinger equation, we study the ionization of helium atoms with different forms of the atomic potential, including the soft-core potential, the model potential, and the short-range potential, in orthogonally polarized two-color laser fields. We show that in the case of the long-range atomic potentials (the soft-core potential and the model potential), the photoelectron momentum distributions exhibit asymmetric structures, while for the short-range potential, they present nearly symmetric structures. Besides, the asymmetric structures are sensitive to the specific forms of the atomic potential. We find that the asymmetric structures are more pronounced for the lower laser intensity and/or the shorter laser wavelength. Our results may provide a reference for further analytical studies of strong-field ionization of complex atoms and molecules, where the Coulomb effects are included for quantitative descriptions.
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