High resolution measurements of hyperfine structure on the 303->2 12, 423->514, 523->616, and 61S->524 rotational transitions in CH2F2 were made using a molecular beam maser spectrometer. The components of the fluorine spin-rotation tensor obtained from the data are Maa (F)= -20.4±1.0 kHz, Mbb (F)= -4.9±0.5 kHz, and Mcc (F)= -13.1±0.5 kHz. Components of the hydrogen spin-rotation tensor are Maa (H) = 6.5±3.0 kHz, Mbb (H)= 1.0±1.4 kHz, and MK (H) = 0.3±1.3 kHz. Precise values for the rotational transition frequencies are also reported. Relations between the spin-rotation tensor and the magnetic shielding tensor for CH 2F2 are discussed. Combining the experimental spin-rotation tensor with the diamagnetic shielding tensor from the atom-dipole model, leads to the determination of the magnetic shielding tensor a aa= 407 ppm, abb, = 390 ppm, occ = 217 ppm, and aAv = 338 ppm.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry