Knowledge Bank

The microwave spectrum of piperidine exhibits two non-rigid rotor Q-branch satellite series 1400 Mc/sec from the normal lines, and which overlap the normal lines in $C5H10ND.1$ The microwave spectra of $C5D10NH$ and $C5D10ND$ have been measured. One non-rigid rotor satellite about 70 Mc/sec from the main lines was found for $C5D10ND$. The possible origin of the anomalous transitions in $C5H10NH$, in view of the results for the deuterated species, will be discussed.