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