Relaxation time studies are reported of toluene and the isotopic derivatives, toluene-αd3 and toluene-d5, between 20 K and their melting points. Mechanisms controlling the relaxation process, including the role of methyl group tunnelling at low temperatures, are discussed and restricting barrier heights calculated.
A. M. I. Ahmed and R. G. Eades, J. Chem. Soc., Faraday Trans. 2, 1972, 68, 1337 DOI: 10.1039/F29726801337
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