Complex self-consistent-field and configuration-interaction studies of the lowestP2resonance state ofBe−

Abstract

The position and width of the lowest ${}_{}{}^2{}_{}{}^{}P$ resonance in electron-beryllium scattering are computed directly in configuration-interaction calculations with the use of the method of complex basis functions. These calculations make use of a reference wave function from a complex self-consistent-field calculation on ${\mathrm{Be}}^{-}$ with the use of complex Slater basis functions. The most extensive calculation performed includes 745 single, double, and triple excitations from the reference configuration and yields values for the position and width of 0.323 and 0.296 eV, respectively. Comparison is made with previous theoretical determinations. No experimental values are currently available.