X alpha method with theoretically determined parameter α- Exchange parameters α and ionisation energies of multiply charged ions

Ionisation potentials of multiply charged ions have been calculated with the x alpha method using self-consistently determined parameters alpha . Self-consistent ab initio exchange parameters alpha have been determined for several ions. The ionisation energies have been determined by the transition state method of Slater and in a few cases by the method of Williams et al. (1975). The calculated ionisation energies are compared with Hartree-Fock and experimental data and found to be in agreement with them.