Neutral decay of double-holed doubly excited resonances ofN2

The neutral decay of doubly excited resonances (DER’s) of ${\mathrm{N}}_2$ has been observed by measuring the excitation spectrum of vacuum ultraviolet fluorescence emitted from photodissociation fragments in the 20–38-eV region. A number of DER’s with the [(1${\mathrm{\pi }}_{\mathit{u}}$ ${)}^{\mathrm{-}1}$(3${\mathrm{\sigma }}_{\mathit{g}}$ ${)}^{\mathrm{-}1}$(${\mathrm{\pi }}_{\mathit{g}}$ ${)}^1$:C ${}_{}{}^2{}_{}{}^{}\mathrm{\Sigma }_{\mathit{u}}^{+}{}_{}{}^{}$]ns${\mathrm{\sigma }}_{\mathit{g}}$ Rydberg series (n=3–10) have been revealed. Rydberg progressions onto the ${\mathrm{N}}_2^{+}$(D ${}_{}{}^2{}_{}{}^{}\mathrm{\Pi }_{\mathit{g}}^{}{}_{}{}^{}$) state have also been observed. Strongly dissociative DER’s correlating with satellites have been shown as broad peaks in the 23–33-eV region, which have appeared to have a correlation with the single-holed (X ${}_{}{}^2{}_{}{}^{}\mathrm{\Sigma }_{\mathit{g}}^{+}{}_{}{}^{}$)${\mathrm{\sigma }}_{\mathit{u}}$ shape resonance.