The fundamental vibration-rotation band of deuterium chloride

Abstract

The fundamental vibration band of deuterium chloride near 5μ has been re-examined using much greater resolving power than previously. The isotopic splitting of the rotation lines has been completely resolved, and a greater number of lines has been measured in each of the branches forming the band. Rotational constants have been determined for the two combining states, and values have also been obtained for the centrifugal stretching constants. The relative values are in very good agreement with those to be expected for a pair of isotopic molecules with the atomic masses concerned. The new value (1·274 6 Å) derived for the bond length in both species of deuterium chloride agrees to a very high degree with that found in the preceding paper for the isotopic molecule hydrogen chloride.