X-Ray Scattering by Triplet Excitons

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Abstract
An experimental study of the temperature dependence of the intensities of x rays diffracted from ionic molecular crystals containing triplet excitons provides strong evidence for distortions associated with exciton—phonon interaction. The effects of thermally excited excitons, and thermally excited phonons, on diffracted x-ray intensities are distinguished by their different temperature dependences. The experimental accuracy of the observed diffracted intensities is not high enough to distinguish between ``localized'' or ``self-trapped'' excitons, and ``free'' or ``distributed'' excitons.

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