Measurement of hyperfine structure in CH2F2 by beam maser spectroscopy

Publisher Website
Google Scholar
Abstract
High resolution measurements of hyperfine structure on the 303→ 212, 423→ 514, 523→ 616, and 615→ 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 Mcc(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 CH2F2 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 σaa=407 ppm, σbb=390 ppm, σcc=217 ppm, and σAv=338 ppm.