Continuum ionization transition probabilities of atomic oxygen

The technique of photoelectron spectroscopy has been used to obtain the relative continuum transition probabilities of atomic oxygen at 584 Å for transitions from the ${}_{}{}^3{}_{}{}^{}P$ ground state into the ${}_{}{}^4{}_{}{}^{}S$, ${}_{}{}^2{}_{}{}^{}D$, and ${}_{}{}^2{}_{}{}^{}P$ states of the ion. The ratio of the transition probabilities for the ${}_{}{}^2{}_{}{}^{}D$ and ${}_{}{}^2{}_{}{}^{}P$ states relative to the ${}_{}{}^4{}_{}{}^{}S$ state of the ion are 1.57 ± 0.14 and 0.82 ± 0.07, respectively. In addition, transitions from the excited ${\mathrm{O}}_2\left(a{}_{}{}^1{}_{}{}^{}\Delta _g^{}{}_{}{}^{}\right)$ state into the $\mathrm{O}_2^{}{}_{}{}^{+}\left({}_{}{}^2{}_{}{}^{}\Phi _u^{}{}_{}{}^{} \mathrm{and} {}_{}{}^2{}_{}{}^{}\Delta _g^{}{}_{}{}^{}\right)$ states were observed. The adiabatic ionization potential of $\mathrm{O}_2^{}{}_{}{}^{+}\left({}_{}{}^2{}_{}{}^{}\Delta _g^{}{}_{}{}^{}\right)$ was measured as 18.803 ± 0.006 eV.