A new method of calculating the spectrum and the self-consistent field of negative ions

A new method is suggested for negative ion calculations, based on perturbation theory with a model zeroth approximation and a polarization potential formalism. The binding energy of an electron in an Na^– ion is calculated as a test, and is found to agree with experiment.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 41–46, September, 1990.In conclusion, the author is grateful to E. P. Ivanova for her interest, to V. V. Flambaum and V. K. Ivanov for supplying preprints of [8, 9], and to V. V. Filatov for help in the numerical calculations.