Investigation of rare gas–oxygen exciplexes

Mixtures of rare gases (Rg) with oxygen donors at high pressures were excited by an electron beam. The fluorescence spectra in the ultraviolet were investigated. Besides the well-known continua of KrO (180 nm) and XeO (235 nm) several new transitions were identified. They are attributed to the decay of RgO and possibly of Rg2O. The study of the reaction kinetics yielded the rate constants for the most important buildup and decay reactions of KrO and ArO. The inverse lifetime of KrO was determined to be 3 × 106 s−1 for ArO to be