Abstract

The energy states of mixed molecular crystals in the rigid lattice are treated with special reference to impurity molecules differing only by isotopic substitutions from the host molecules. The perturbation Hamiltonian is treated explicitly, and the calculation made by an elaboration on the Green function method used by Koster & Slater for electron traps. Formulae for the energy levels and transition moments are given for dilute crystals and for crystals with any concentration of guests arranged in a superlattice. Virtual coupling between different guest molecules (trap-to-trap coupling) is considered, and limiting formulae derived.

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