In a crystal containing more than one species of nuclear spin in a large dc magnetic field, the secular dipolar interactions between all spins, unlike as well as like, form a single reservoir described by a single spin temperature. We demonstrated this concept with experiments on LiF. In particular, we showed that T1D of ⁷Li and ¹⁹F are equal. We also measured T₁ and T_1ρ of ¹⁹F using ⁷Li detection. Finally we applied this concept to the Provotorov theory of saturation, which we extended to the case of a two-spin system, and demonstrated experimentally the validity of the treatment.
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Stokes et al. (1977) studied this question.
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