title: New summation rules for coulomb wave functions
abstract: Sums of products of the Coulomb wave functions over degenerate manifolds have been obtained in a closed form. These sums appear in many atomic and molecular problems. The sums have been obtained making use of the properties of the Coulomb Green's function G(r, r('),E), in the limit E-->E(n), where E(n) is the eigenenergy of the hydrogenlike atomic ion. The closed Hostler-Pratt form of G in the coordinate representation has been used. The sums calculated are a consequence of the n degeneracy of the Coulomb atomic energy levels. This itself, as is well known, follows from the four-dimensional symmetry of the Coulomb problem for the hydrogen atom.
authors.affiliation: Russian Research Center "Kurchatov Institute", Institute of Nuclear Fusion, Kurchatov Street 1, 123182 Moscow, Russia.
authors.initials: M
authors.lastname: Chibisov
authors.initials: AM
authors.lastname: Ermolaev
authors.initials: F
authors.lastname: Brouillard
authors.initials: MH
authors.lastname: Cherkani