Measurements of the proton relaxation rates of lanthanide (III) aquo-ion solutions show that the correlation times, which govern the proton relaxation times in these solutions, are very short (ca. 10–13s), and are predominantly due to the electron-spin relaxation times of the cations. The variations in the relaxation rates of different LnIII ions are discussed in terms of modulation of the different ligand-field splittings. The temperature dependence of the relaxation rates has also been studied and a relationship to the magnitude of ligand-field splittings of the different LnIII ions is discussed.
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Alsaadi et al. (1980) studied this question.