1–0, 2–0, 3–0, Absorption Bands of Dense Forms of Pure CO and Its Solutions in N2 and Ar

Abstract

The first overtone and the second overtone bands of pure CO as well as the first overtone band of CO in solution in the gaseous, liquid, and solid states of N₂ and Ar have been studied. The method for obtaining under pressure long lengths of transparent solids is described. A principal band due to C¹²O¹⁶ and a weak satellite due to the isotopes C¹³O¹⁶ and C¹²O¹⁸ have been found, and displacement of the maximum of the principal band and this satellite have been measured. The results are compared with those found for the fundamental by the condensed matrix method. The form of the band, in particular, its half‐width, as a function of temperature and density is discussed.