Knowledge Bank

The $\nu 2a$ vibration-rotation spectrum of $CH2D2$ in the $1435cm-1$ region has been analyzed. With the distortion parameters fixed to the ground-state values except for $\tau yyyy$ the following constants have been obtained: $\nu 2a=1435.16,A\prime \prime =4.3017,R\prime \prime =3.5059,C\prime \prime =3.0518,A\prime =4.2663,B\prime =3.5921$, and $C\prime =3.1656$ $cm-1$^{\prime}. Anomalous $\tau yyyy$ for the $q4$ state is due to the Coriolis interaction with the $q7$ state at $1234cm-1$.