Temperature dependence of spin–lattice relaxation probabilities in the excited triplet state of crystalline benzil
A. A. AvdeenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovV. А. KarachevtsevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovYu. V. NaboĭkinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovS. N. PakulovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
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In the temperature range 6–40 °K we studied the temperature dependence of the rate constants of electron spin-lattice relaxation between the most photoactive sublevel of the excited triplet state of crystalline benzil and the other two sublevels. Analysis of this temperature dependence reveals that spin–lattice relaxation is induced by thermal transitions to local phonon states which result from conformational changes in photoexcited benzil molecules in the matrix of the unexcited crystal.
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