Theoretical study on the nondipole asymmetries of Kr 1s1/2 and 4p3/2 photoelectrons

A theoretical study has been conducted on nondipole asymmetry parameters and angular distribution of Kr 1s1/2 and 4p3/2 photoelectrons with Dirac-Fock method based on the density matrix theory, with a focus on the impacts of nondipoles on the photoelectron angular distribution. The results show that the electric-dipole-electric-quadrupole E1 and E2 interference has a significant influence on the spatial angular distribution of Kr 1s1/2 and 4p3/2 photoelectrons. To be specific, the photoelectron characteristics relevant to the direction of the polarization vector of the incident light can be destroyed by the E1 and E2 interference. For the Kr 4p3/2 photoelectron, it is suggested that the non-dipole effects of photoelectron distribution be measured in two energy positions where the electric dipole β parameter equals to zero. Higher order nondipole effects are negligible according to the investigations. Our calculations consist well with the available experimental and theoretical results.