Photoionization of the beryllium atom

Abstract

Photoionization cross sections of the Be atom are calculated using the hyperspherical close-coupling method where a model potential is employed to approximate the screening of the 1${\mathit{s}}^{2}$ closed-shell core electrons. The cross sections obtained below the ${\mathrm{Be}}^{+}$(2p) threshold agree well with the results of other calculations and with experiment. Total and partial photoionization cross sections for photon energies between the ${\mathrm{Be}}^{+}$(2p) and ${\mathrm{Be}}^{+}$(3s) thresholds are also calculated.