Hall transformation of exp( – r): Correction of the results

Owing to an error in his determination of the repulsion integral and the kinetic energy. Hall's results 1] for the ground state of atomic two-electron systems are wrong. Here these results have been corrected. For Z ≤ 5, the results have been obtained by determining the pertinent integrals numerically: but for Z ≥ 5, these can be found sufficiently accurately from Z expansions.