Vibration–Rotation Bands of Deuterium Cyanide and Hydrogen Cyanide*

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Abstract
Six vibration–rotation bands of DCN between 2 and 6 μ have been analyzed. All the rotational constants have been obtained through the terms quadratic in vibrational quantum numbers. Two quadratic and seven cubic vibrational anharmonic constants have been obtained explicitly. Seven combinations of quadratic and cubic vibrational constants have also been obtained. Data are given on the analysis of the two parallel fundamental bands of D13CN, as well as the ν3 bands of DC15N, HI3CN, and HC15N. Δ–Δ transitions of both DCN and HCN in the ν3 fundamental regions have been analyzed. The splitting of the Δ levels was clearly observed for the first time and is in agreement with the l-type resonance calculations. The line structure of the Q branches of both Π–Π and Δ–Δ “hot bands” has also been resolved. By means of the Ritz principle the levels 2ν20, 2ν22, and ν21 of DCN and 2ν22 of HCN have been determined.

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