Knowledge Bank

The torsional vibration spectra of $(CH3)2CHX$ and $(CH3)2CX2$ molecules, $(X=halogenatom)$ were investigated and the barrier to internal rotation calculated. The low frequency vibrations of $CH3CH2Cl,CH3CH2$, and $CH3CH2Br$ were reinvestigated in the $350-90cm-1$ spectral region and compared with the spectra of deuterated species. The calculation of the potential barrier will be discussed. The torsional vibration spectra of $(CD3)2NH$ and $(CD3)2C=O$ will be presented. Spectra and potential barrier will be compared with the undeuterated species.