Spectroscopy and photochemistry of retinals. II. Theoretical and

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Comprehensive Investigation of the Spectroscopy and Photochemistry of Retinals. 11. Theoretical and Experimental Consideration of Emission and Photochemistry Ralph S. Becker,* Kozo Inuzuka, Jimmie King, and David E. Balke' Contribution from the Department of Chemistry, University of Houston, Houston, Texas 77004. Received April 21, 1970 Abstract: all-trans-, 9-cis-, and 13-cis-retinals exhibit a fluorescence at 77°K in a rigid matrix which is quenched in viscous or fluid solutions at higher temperatures. The 11-cis-retinal shows no fluorescence (