A molecular beam maser spectrometer was used to measure hyperfine structure on the J = 1→0 rotational transitions in CH3CN and CD 3CN. Measured nitrogen quadrupole coupling strengths are eq aaQ(N)=-4224.4± 1.5 kHz for CH3CN and eq aaQ(N)=-4229.3± kHz for CD3CN. The deuterium quadrupole coupling strength along the C-D bond direction is eq zzQ(D)= 167.5±4.0 kHz. Nitrogen quadrupole coupling is discussed in relation to the electronic structure. Spin-rotation interaction strengths are reported. A convenient method for calculating matrix elements for hyperfine interactions in an arbitrary coupling scheme is presented.
|Original language||English (US)|
|Number of pages||5|
|Journal||The Journal of Chemical Physics|
|Publication status||Published - 1973|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics