Precise measurement of hyperfine coupling in CH3F based on nuclear spin conversion
Laboratoire de Physique des Lasers, Atomes et Molécules, CERLA, Centre d'Études et de Recherches Lasers et Applications,
Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France
Revised: 11 May 2000
Published online: 15 November 2000
A new method is proposed for the experimental determination of the hyperfine coupling in molecules. The method is based on the level-crossing effect in the spin isomer conversion in alternating electric fields. An experiment performed with the 13CH3F molecules has revealed the strength of the off-diagonal in K () nuclear spin-spin coupling kHz, which is only by kHz larger than the theoretical value calculated on the basis of the molecular structure.
PACS: 31.30.Gs – Hyperfine interactions and isotope effects, Jahn-Teller effect / 32.80.Bx – Level crossing and optical pumping / 33.15.Dj – Interatomic distances and angles
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000