Energy calculation of the metastable (1s2s2p)⁴P^ostate of He^-and Li

Abstract

Owing to a mistake in algebra made by Holøien and Midtdal in 1955 when evaluating the matrix elements of the kinetic energy part of the Hamiltonian operator, the numerical values obtained for the energy and the coefficients of the corresponding eigenvector are in error The error is associated only with correlated basis functions because the correction term vanishes for those which are non-correlated. The corrected values obtained by the re-examination for lithium are more consistent with recent results from electron-impact experiments. New results for the energy and the corresponding eigenvector are given for a 15th-order subset both for He- and Li