Nondipole effects in the photoionization of neon: Random-phase approximation

The random-phase approximation (RPA) is applied to study nondipole corrections to the angular distribution of photoelectrons from the [Formula Presented] shell of Ne. Calculations of the parameters [Formula Presented] and [Formula Presented] arising from [Formula Presented] interference effects are carried out for the [Formula Presented] and [Formula Presented] subshells of Ne in the photon energy range 100–2000 eV. For the [Formula Presented] shell, the RPA calculations show small effects of correlation near the [Formula Presented] threshold energy, but are otherwise in agreement with independent-particle approximation (IPA) calculations. The RPA and IPA values of [Formula Presented] are also in agreement with experiment. For the [Formula Presented] shell, a small difference between RPA and IPA calculations of the nondipole parameters is found for energies near the [Formula Presented] threshold; however, both RPA and IPA calculations of the parameter [Formula Presented] disagree significantly with experimental measurements for photon energies above 1000 eV. © 1999 The American Physical Society