The vibrational spectra of molecular ions isolated in solid neon. I. CO+2 and CO−2

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Abstract
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 cm−1, 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 cm−1 to ν3 of CO−2. In earlier studies of the charge transfer interaction of an alkali metal with CO2, this vibration of CO−2 had been strongly perturbed by coordination with the alkali metal cation. In the present experiments, the threshold for electron photodetachment from CO−2 was observed in the visible spectral region. Evidence was also obtained for the stabilization of the O2C⋅⋅⋅OCO− cluster anion.