Close-coupling calculations for electron collisions with O⁺and for bound states of neutral oxygen

Improved collision strengths are calculated for the transitions between the terms 4 S 0 , 2 D 0 and 2 P 0 of the ground configuration 2s 2 2p 3 of O + and for the fine-structure transition 2 D 5 2/ 0 - 2 D 3 2/ 0 . The close-coupling approximation for all partial waves of interest is used together with a representation for O + constructed from configuration-interaction wavefunctions. The close-coupling equations are also solved at negative energies for the bound states of the system (e+O + ). The calculated eigenenergies of neutral oxygen are in close agreement with experiment and represent significant improvement over the multiconfiguration Hartree-Fock calculations of Bagus, Hibbert and Moser (1971).