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Thermally Activated Methyl And T-Butyl Group Reorientation In Solids, Peter A. Beckmann

Physics Faculty Research and Scholarship

We reinterpret proton spin-lattice relaxation measurements in solid 1,4-di-t-butylbenzene (1,4-DTB) [P. A. Beckmann, F. A. Fusco, and A. E. O'Neill, J. Magn. Reson. 59 63 (1984)] in light of a recent study of solid 1,3-DTB [P. A. Beckmann, A. I. Hill, E. B. Kohler, and H. Yu, Phys. Rev. B 38 11098 (1988))]. We investigate the relationship between the spectral density that characterizes the intramolecular reorientation of the t-butyl groups and their constituent methyl groups in DTB, and the t-butyl group environment which dictates the symmetry of the local electrostatic potential. For both isomers, if one assumes a sixfold potential, …