When a Ne:CO2 sample was codeposited at approximately 5 K with a beam of neon atoms that had been excited in a microwave discharge, an absorption appeared at 1421.7 cm1, very near the gas‐phase band center for the antisymmetric stretching fundamental (ν3) of CO+2. Detailed isotopic substitution studies support the assignment of this absorption to that fundamental of CO+2, as well as of an absorption at 1658.3 cm1 to ν3 of CO2. In earlier studies of the charge transfer interaction of an alkali metal with CO2, this vibration of CO2 had been strongly perturbed by coordination with the alkali metal cation. In the present experiments, the threshold for electron photodetachment from CO2 was observed in the visible spectral region. Evidence was also obtained for the stabilization of the O2C⋅⋅⋅OCO cluster anion.

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