Variable Trap Problem in Isotopic Mixed Crystals of s-Triazine

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Abstract
Theoretical treatments of isotopic mixed crystals, in general, have assumed that the intermolecular interactions are equal and that the problem can be reduced to a consideration of the free molecule excitation energies. It is shown that for the isotopic s‐triazines the intermolecular interactions are different and that now it is necessary to consider a trap depth which is both concentration and distribution dependent. This has necessitated a modification of the existing theories. Experimental results have been obtained over the entire concentration range for the s‐triazined‐0/s‐triazined‐3 mixed crystal system, and the results have been qualitatively explained in terms of a concentration dependent trap depth.

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