Abstract
AbstractThe processes of spin‐lattice relaxation of the excited local triplet states in molecular crystals at low temperatures are investigated. The coupling of the translational and rotational motion of the molecule (TRC relaxation mechanism) is chosen as the major phenomenon, leading to the coupling of the spin system with acoustic vibrations. The general expressions for the spin‐lattice relaxation time of the triplet centre in molecular crystal with impurities are derived taking into account the change of force constant due to the impurities. The angular, field, and temperature dependences of SLR time are calculated for an isotopic impurity in naphthalene crystal. The results of calculation are in accordance with available experimental data.
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