Electron-impact excitation of atomic oxygen

The excitation cross sections $Q({}_{}{}^3{}_{}{}^{}P-3s{}_{}{}^3{}_{}{}^{}S_{}^o{}_{}{}^{})$ and $Q({}_{}{}^3{}_{}{}^{}P-3s{}_{}{}^5{}_{}{}^{}S_{}^o{}_{}{}^{})$ are calculated using a close-coupling formalism, which includes exchange effects. A cascade-adjusted cross section for $Q({}_{}{}^3{}_{}{}^{}P-3s{}_{}{}^3{}_{}{}^{}S_{}^o{}_{}{}^{})$ is obtained which agrees with the experimental cross section of Stone and Zipf within estimated error uncertainties. Finally, some discussion is given concerning the effects of poorly positioned ${\mathrm{O}}^{-}$ autodetaching states, which are introduced by an inadequate close-coupling expansion.