Knowledge Bank

The absorption of deuterium sulfide has been observed and measured under high resolution from 4500 to $4675cm-1$. The rotational structure has been analyzed through the use of published energy and line strength tables for the rigid asymmetric rotor. A classical centrifugal distortion was applied to the rigid energy levels. The absorption is attributed to the vibrational band having an excited state with the quantum numbers $(n1,n2,n3)=(1,1,1)$. More than 100 lines with have been assigned with an average deviation of less than $.08cm-1$. Using the ground state inertial constants the D-S distance is calculated to be 1.345A and the DSD angle to be $92\circ 16\prime$, in excellent agreement with similar structural parameters determined for $H2S$ from infrared studies.