Deuteron Zeeman Relaxation of CD4 in the Isotropic Liquid, the Liquid Crystalline, and the Solid State of Several Substances

Authors

Peter A. Beckmann, Bryn Mawr CollegeFollow
Myer Bloom
E. Elliott Burnell

Document Type

Article

Version

Publisher's PDF

Publication Title

Journal of Chemical Physics

Volume

84

Publication Date

1986

Abstract

Measurement of deuteron Zeeman relaxation rates of CD₄ dissolved in benzene, hexane, and the liquid crystals MBBA, EBBA, and Merck ZLI‐1132 and in pure CD₄ gas as a function of temperature at 30.7 and 61.4 MHz shows that the CD₄ is uniformly dispersed in the liquid solvents but resides in gas pockets when the solvents are in the solid state. Effects of centrifugal distortion were observed in the gas phase. The relaxation rate was found to be nearly independent of solvent, temperature, and pressure for the methane–liquid mixtures. This result is explained in terms of the extended diffusion model for the combined effects of free molecular rotation and collisions on the spectral density of quadrupolar interactions when the collisional and mean free rotational periods are of the same order of magnitude. It can also be interpreted in terms of the Fokker–Planck–Langevin model for rotational Brownian motion.

Publisher's Statement

Copyright (1986) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Chem. Phys. 84, 5898 (1986) and may be found at http://jcp.aip.org/resource/1/jcpsa6/v84/i10/p5898_s1.

Citation

P.A. Beckmann, M. Bloom and E.E. Burnell, J. Chem. Phys 84, 5898 (1986).

DOI

10.1063/1.449901