Infrared Spectrum of Deuterium Sulfide

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Abstract
The bending fundamental (v2) of D2S has been investigated under high resolution. Centrifugal‐distortion corrections were applied in the rotational analysis, and transition intensities were computed in both the rigid‐rotor approximation and with the inclusion of classical centrifugal distortion. The inertial constants arising from this analysis for the ground state are A=5.484, B=4.508, C=2.444; for the excited state they are A′=5.616, B′=4.585, C′=2.4216 cm−1, and the v2 band center is 855.45 cm−1. These results together with information derived from previous investigations of D2S and H2S have been used to evaluate the constants in the quadratic expression for the vibrational energy levels and to compute some of the constants in the general expressions for the moments of inertia as a function of vibrational quantum numbers. The experimental values of the inertia defect for the ground state and the v1 and v2 excited states are in good agreement with those predicted theoretically.

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