The effects of strong excitation-phonon coupling on mixed crystal spectra: Diphenylmethylene in benzophenone

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Abstract
We present low temperature absorption and emission spectra of diphenylmethylene in benzophenone. Although the spectra are broad at temperatures greater than ∼20 K, considerable structure appears at lower temperatures. The spectra and their temperature dependence are readily explained by a large excitation‐phonon coupling which is expected for this type of mixed‐crystal system.