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Solutions of Fock's equation for the self-consistent field with exchange have been carried out for the negative ions Na − , K − . The results indicate that these negative ions can certainly exist; and calculations of the energy values, and estimates of the errors of these values, indicate that these ions are probably stable and not liable to autoionization. The wave functions for these negative ions are required in calculating atomic cross-sections for the capture of electrons by the neutral atoms.
Hartree et al. (1938) studied this question.