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In the temperature range 120 to 300 O K a study has been made of the infrared absorption spectra of KC1 and KBr single crystals doped with Se0:-and Se0:-anions. It is shown that the Se0,2-anions in these matrices form complexes SeO:-. M2+ of symmetry Cp, with cations M2+ (M2' -Ca2', Sr2-, Ba") similar t o the complexes SO,"-N2+ and CrOi--M2-observed earlicr. A lowering of the local symmetry results in the splitting of VJF) vibration of the tetrahedral anion SeO:-. An identification of bands and their fine structure assumed to be isotropic was made in the infrared absorption spectra of the complex SeO2-. RIPf. The existence of similar complexes SeOi-* MZ7 was assumed in KBr and KCI lattices doped with Se0;-In connection with the quartet structure of infrared absorption spectra in the vibration region YJE) of the Se0;-anion.

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