Infrared Spectra of Carbon Monoxide as a Solid and in Solid Matrices

Abstract

The fundamental infrared absorption frequency of several isotopes of CO has been observed in solidcarbon monoxide and in the solid matrices N2, Ar, and CH4. In addition, the overtone in solidcarbon monoxide has been measured. It is shown that frequency shifts due to isotopic substitution in the solid state follow the formulas developed for the gas phase only when molecules of the same isotopic species are not adjacent to each other, i.e., only in dilute solutions.