The proton spin–lattice relaxation time (T1) of liquid crystalline methyl-deuterated p-azoxyanisole (PAA-d6) was measured at four frequencies as a function of its concentration in perdeuterated PAA. Analysis of the isotope dilution data showed that the intermolecular contribution to the relaxation rate becomes more important at lower frequencies, and in intramolecular contribution has a less pronounced frequency dependence than the intermolecular part.
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Fung et al. (1976) studied this question.
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