Photoelectron angular distributions for photoionization of argon by two-color fields

Abstract

We perform numerical simulations for photoionization of the argon atom when exposed to a combined field of an infrared laser (abbreviated IR) and its 13th harmonic (H13) by solving the Time-Dependent Schr\"odinger Equation (TDSE)], noting that the associated energy spectrum displays a harmonic peak dressed by the IR and other peaks called side-bands SB+-n corresponds to the absorption (+n) and the emission (-n) of the n-infrared photons above the ionization threshold. In two-color H13+IR photoionization of argon, the analysis of the angular distribution of the ejected electron in the continuum, and our calculation approach is based on the method of projection of the electronic wave function on the states of the continuum, the latter was found in using the Runge-Kutta 4 method and the Schutting method. Our simulation results demonstrate that either for the harmonic peak or the sideband, the shape of the angular distribution exhibits a good agreement with the interpretation based on the generalized Fano rule for the absorption and emission of photons.