Infrared Spectrum of Solid Carbon Monoxide

Abstract
The infrared spectrum of solid carbon monoxide at 20°K has been examined in the fundamental and overtone regions. Sharp features (bandwidths about one cm−1) are assigned to vibrational modes of the various isotopic species: C12O16, 2138.1 cm−1; C12O17, 2112.3 cm−1; C13O16, 2092.2 cm−1; and C12O18, 2088.4 cm−1. These frequencies are examined with the aid of existing theories of frequency shifts in condensed phases. A broad absorption (bandwidth about 40 cm−1) centered at 2208 cm−1 is assigned to combinations of the fundamental mode with lattice modes. Calculations suggest that the lattice modes involved probably include translations as well as librations.

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