Abstract
Temperature-dependence measurements have been made on the deuteron spin—lattice relaxation times for liquid deuterium oxide and perdeuterobenzene. The quadrupole spin—lattice relaxation is expressed in terms of motional models previously developed for magnetic dipole—dipole relaxation. The deuterium oxide data are discussed in terms of microwave, dielectric relaxation, and hydrogen-bonding phenomena. The T1 values follow rather closely a proportionality to absolute temperature divided by viscosity. The effective quadrupole coupling constant is only ⅔ to ¾ of the value derived from microwave data. For perdeuterobenzene, the 1.86-kcal/mole activation energy rules out a dominance of the rotational-inertia effect proposed recently by Steele. The temperature dependence is much lower than that of the absolute temperature divided by viscosity. Possible reasons for this are discussed. By use of proton-relaxation data, a quadrupole coupling constant value of 138 kc/sec is estimated, assuming axial symmetry of the electric-field gradient about the C—D bond.
Published Version
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