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.
Nuclear spin conversion in CH3F induced by magnetic particles
β Scribed by P.L. Chapovsky
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 315 KB
- Volume
- 254
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
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 Γ 10 -5 s-t/Torr, having low isotope dependence. These results allowed us to conclude that collisions with magnetic particles cannot be the main mechanism behind the spin conversion in CH3F observed earlier.
π 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
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