Infrared Spectrum of Carbon Dioxide Anion Radical

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Abstract
Pressed alkali halide disks of infrared spectroscopy have been used as matrices to trap and to stabilize the carbon dioxide anion free radical. The radical was generated by exposing disks containing the formate ion in solid solution to gamma rays from a cobalt source. The ESR, the ultraviolet, and the infrared spectra of the radical have been identified. From the carbon−12 and −13 isotopic frequencies of the antisymmetric CO‐bond stretching infrared band, a valence angle of 127°±8° was calculated for this radical. The radical reacted with water to produce bicarbonate and formate ions.