# THE TRIPLET STATE OF $1,1'$-DIETHYL-$2,2'$-CYANINE IODIDE IN NEAT AND MIXED CRYSTALS

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 Title: THE TRIPLET STATE OF $1,1'$-DIETHYL-$2,2'$-CYANINE IODIDE IN NEAT AND MIXED CRYSTALS Creators: Marchetti, Alfred P.; Scozzafava, M. Issue Date: 1976 Publisher: Ohio State University Abstract: The singlet-triplet absorption spectrum of crystalline $1,1^{\prime}$-diethyl-$2,2^{\prime}$-cyanine iodide has been obtained. The absorption origin consists of two lines separated by $\sim 4.0$ $cm^{-1}$. Zeeman spectra were used to assign the higher energy, more intense line to the $A_{u}$ factor group state and the lower energy line to the $B_{u}$ factor group state. Emission spectra have been obtained on both dilute and concentrated solid solutions of the dye. The results from the concentrated samples indicate that the largest excitation-transfer interaction between crystallographically equivalent molecules is less than $1 cm^{-1}$. This work represents the first spectroscopic characterization of the triplet state of an ionic dye crystal. Description: Author Institution: Eastman Kodak Company Research Laboratories URI: http://hdl.handle.net/1811/9876 Other Identifiers: 1976-TR-2