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[en] The ground state energy of a hydrogenic atom of nuclear charge Z, perturbed by a polynomial perturbation, is calculated by means of a variational modification of Rayleigh-Schroedinger perturbation theory, which is effective for all negative lambda. (author)
Journal
Journal of Physics. A, Mathematical and General; ISSN 0305-4470; 
; v. 16(17); p. 4025-4030
; v. 16(17); p. 4025-4030