Abstract
Evidence of CO 2 occlusion in halogen salts of alkaline metals is given by IR spectra. Strong interaction between CO 2 and the salt is is manifested by ν 3(CO 2) shifted about 150 cm −1 from its position in gaseous state. The shift of ν 2(CO 2 about 40 cm −1 confirms this fact. The positions of ν 3 (CO 2) band in halogen salts (C1, Br, I) of alkaline metals (Na, K, Rb, Cs) are given. Band position dependence on anion and cation with respect to the crystal lattice of the salt is discussed. Examples of an other type of occlusion, manifested by ν 3(CO 2) position very close to gaseous state, are also given.
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