Exciton-enhanced KrO excimer luminescence in doped solid krypton

We have observed KrO excimer emission resulting from photoexcitation of cryodeposited films of Kr:${\mathrm{N}}_2$O. Both direct and exciton-enhanced dissociation of $\mathrm{O}\left({}_{}{}^1{}_{}{}^{}S\right)$ from ${\mathrm{N}}_2$O was observed. Our data yield a direct threshold of 7.9 eV and a relative quantum yield at higher resolution than recently reported for the gas phase. The large luminescent intensity observed indicates excimer decay via allowed ${}_{}{}^1{}_{}{}^{}\Sigma _{}^{+}{}_{}{}^{}\to {}_{}{}^1{}_{}{}^{}\Pi$ and ${}_{}{}^1{}_{}{}^{}\Sigma _{}^{+}{}_{}{}^{}\to {}_{}{}^1{}_{}{}^{}\Sigma _{}^{+}{}_{}{}^{}$ transitions.