Abstract
Electron-collision excitation cross sections of inelastic transitions among the 28 LS terms of the 2s22p3, 2s2p4, 2s22p23s, 2s22p23p, 2s22p23d and 2s22p24s configurations of singly-ionized oxygen are calculated using the R-matrix method. The target states are represented by fairly extensive configuration-interaction wavefunctions which yield excitation energies, oscillator strengths and radiative lifetimes of excited states that agree well with available calculated and measured values. To assess the importance of electron correlation and coupling to higher excited states in the scattering calculation, the present 28-state calculation is compared with the earlier 11-state R-matrix theory. Our cross sections for the 2s22p3 4So-2s22p3 2Do and 2s22p3 4So-2s2p4 4P transitions show good agreement with the merged-beams energy-loss experiment and the 11-state R-matrix theory.
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