2s22p2Potriply excited state ofHe−

Abstract

The triply excited ${2s}^{2}2p{}^{2}{P}^{o}$ state of ${\mathrm{He}}^{\ensuremath{-}}$ is studied by using the saddle-point complex-rotation method. The energy and Auger width of this resonance are calculated. Relativistic corrections are evaluated with the first-order perturbation theory, and the mass-polarization effect is also included. The partial Auger widths are calculated for the individual open channels. The total width is obtained by coupling the important open channels and summing over the other channels. These results are compared with the theoretical and experimental data in the literature.