State-to-State Behavior in the Neutral Dissociation ofO2Far beyond the Ionization Threshold

The two-dimensional yield spectrum of fluorescence radiation from excited O atoms produced in the neutral photodissociation of ${\mathrm{O}}_2$ is measured as a function of both excitation photon wavelength of 50-62 nm (24.8-20 eV photon energy) and fluorescence wavelength of 80-140 nm. State-to-state neutral dissociation pathway of the Rydberg states converging onto ${{\mathrm{O}}_2}^{+}\left(c{}_{}{}^4{}_{}{}^{}\Sigma _u^{-}{}_{}{}^{}\right)$, $v^{\prime }=1\mathrm{}$ into the $\mathrm{O}\left(ns{}_{}{}^3{}_{}{}^{}S\right)+\mathrm{O}\left({}_{}{}^1{}_{}{}^{}D\right)$ dissociation limit is revealed, where the principal quantum numbers of the Rydberg orbitals are conserved into those of excited O atoms.