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The parameters of the zero-field level splitting of Gd 3+ ions localized in three kinds of tetrahedral clusters are estimated within the superposition approximation. The structure of a cluster is determined by minimizing the energy of the crystal with the embedded cluster. As a result, the strong...
The electron excitation energy transfer between adsorbed molecules on a solid surface via virtual and real surface excitons is considered. The rate of energy transfer via virtual excitons is calculated analytically. The nonradiative energy transfer to surface impurity centers is considered in the...