Comment on approximate molecular orbitals. III. The 1sσ and 2pπ states of HeH++

Abstract

The results and conclusions of a recent paper by Cohen, McEachran, and McPhee concerning a perturbation calculation of the ground-state energy of HeH++ are compared with those found in an earlier paper by Matcha, Lyon, and Hirschfelder, which treated the same problem using essentially identical variation–perturbation techniques with a more general trial function.