Theoretical description of the two-color photoelectron spectra process of hydrogen: comparison between TDSE calculation and Kroll and Watson approach

Abstract

We present a theoretical study of the main characteristics of two-color photoionization of hydrogen atoms byshort strong laser pulses. Our numerical approach is performed by numerically solving the time-dependent Schrödingerequation for a hydrogen atom interacting with Ti:sapphire laser radiation combined with its 15th harmonic. The energyspectra obtained by the direct numerical solution of the Schrödinger equation are compared with those given by theKroll and Watson perturbative approach. This comparison allows us to check the reliability of the latter approximation.