A theoretical model of nuclear spin conversion in gaseous CH3F induced by collisions with magnetic particles has been developed. The spin conversion rate in CH3F molecules embedded in oxygen was found to be equal to 3'/P ~ 1.2 × 10 -5 s-t/Torr, having low isotope dependence. These results allowed us
Nuclear spin conversion rates in 12CH3F and 13CH3F molecules
✍ Scribed by P.L. Chapovsky; D. Papoušek; J. Demaison
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 317 KB
- Volume
- 209
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The nuclear spin conversion rates of "CH,F and 13CHjF are recalculated using newly obtained precise molecular parameters. Previously measured nuclear spin conversion rates and their anomatous isotopic dependence are shown now to be in qualitative agreement with the theory.
📜 SIMILAR VOLUMES
The ortho-para nuclear spin conversion rate of gaseous 13CH3F molecules subjected to an external electric field has been calculated in the framework of intramolecular state mixing. Results are given for the mixing induced by the magnetic dipoledipole interaction between the molecular nuclei. It is f
Rcccivcd 14 Scptcmbcr 1970 Anisotropies 01 the 13C shielding constant @UC) for CIinI and Cll+!X arc obtained from 'k SMi1 studies of these molcculcs in the ncmatic solvents. The results arc compnrcd with the Lhcorctkal vnlues obtained by the molccuklr orhitnl cnlculxtions using thz current theory. T
Pulsed-nozzle, Fourier-transform microwave spectroscopy has been used to establish the ground-state spectroscopic constants &,=2734.6105(11) MHz, D,=1.49(7) kHz, DIK=35.3(4) kHz and Dj$= -230(g) kHz for the dimer (CH,),"N...HF from its rotational spectrum. The H,19F spin-spin coupling constant D zF