Additional resonances in electron scattering by atomic oxygen

Four new resonances, located at 10.73, 12.55, 14.40, and 15.65 eV, are observed in electron scattering by atomic oxygen. Two of these resonances, located at 10.73 and 15.65 eV, have been predicted theoretically to occur at 10.63 [$(^{4}S)3{p}^{2}^{6}P$] and 15.75 eV [$(^{2}P)3{p}^{2}^{4}D$] respectively. We attribute the two other resonances at 12.55 eV and 14.40 eV, to the configurations $(^{2}D)3s3p$ and $(^{2}P)3s3p$. With the addition of these new identifications, a total of ten resonances are now known to occur in atomic oxygen, completing the triad of resonance configurations, $3{s}^{2}$, $3s3p$, and $3{p}^{2}$, associated with each of the three lowest ($^{4}S, ^{2}D, ^{2}P$) positive ion states.