Knowledge Bank

Beam maser spectrometer systems were used to make high resolution measurements of $J=1\leftarrow 2$, K=0 and K=1 transitions in $CH3CN$ and $CH313CN$. We believe that this is the first beam maser measurement of K=1 states in a symmetric top. Hydrogen and $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C$ spin-rotation tensor components were measured and analyzed to give data on magnetic shielding tensor components. Precise values for quadrupole coupling strengths are also obtained. High resolution microwave spectra of $CD3Br$ and $CH3CCD$ were obtained using the beam maser. This data was analyzed to obtain deuterium quadrupole coupling strengths.