Knowledge Bank

A number of previously unreported infrared bands of $CH3D$ have been observed with high resolution and have been analyzed to obtain the spectroscopic constants. The previously reported bands of $CH3D$ at $2780cm-1$ and $3016cm-1$ have also been observed with better resolution than heretofore. A short discussion of the features of some of these bands will be presented. As examples of these features, it has been observed that the l-type doubling q's for the two degenerate bending modes $\nu 5$ and $\nu 6$ are of opposite sign, and the parallel component of the combination of these two modes is affected by vibrational l-type $resonance1,2$.