The infra‐red spectra of H2Se, D2Se and HDSe have been measured and the positions of the three fundamental frequencies for each molecule have been determined. These are; for H2Sev1= 2260 cm—1,v2= 1074 cm—1,v3= 2350 cm—1; for D2Se,v1= 1630 cm—1,v2= 745 cm—1,v3= 1696 cm—1; for HDSe,v1= 1691 cm—1,v2= 905 cm—1andv3= 2352 cm—1. Interpretation of the observed data has led to the adoption of an obtuse model where the H&sngbnd;Se&sngbnd;H bond angle is slightly in excess of 90°. The H&sngbnd;Se distances are evaluated to be 1.6A and the H&sngbnd;H distance is equal to 2.3A. The product relations of Redlich are made use of as a verification of a correct assignment of frequencies and for a correct determination of the band centers.
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