Relaxation of spin in triplet excitated impurity sites of organic molecular crystals

The paper is concerned with deuterium naphthalene crystal with naphthalene impurity. The aim is to investigate the spin-lattice relaxation in triplet excitated impurity sites of organic molecular crystals at low temperatures and strong magnetic fields. The different low-temperature mechanisms of spin-lattice relaxation in triplet excitated single and pair impurity sites of organic molecular crystals have been offered. Within the offered mechanisms the anomalous fields dependence of spin-lattice relaxation velocity for first order direct processes has been explained,the acoustic-phosphorescence double resonance phenomenon has been analyzed, the non-trivial frequency dependence of spin-lattice relaxation times in pair claster and single impurity molecules connected with them has been predictedAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio