Abnormal photoelectron angular distribution of Ar atoms in pulsed XUV and IR laser fields

Abstract

Synopsis We calculated the photoelectron angular distribution of Ar atoms in pulsed XUV and IR laser fields by solving the time-dependent Schrödinger equation and found that the angular distributions of sidebands are not always straight lines in the energy-angle plot as predicted by the strong field approximation. Further study shows that the abnormality is attributed to the photoelectron-nucleus Coulomb interaction. The abnormality depends on the IR intensity, IR pulse duration, XUV photon energy and the time-delay between the two pulses.