title: The origin of the wavelength-dependent photoreactivity of trans-urocanic acid.
abstract: Two-color, pulsed-laser photoacoustic calorimetry is used to distinguish between multiple rotamer or electronic state contributions to the absorption spectrum of the epidermal chromophore trans-urocanic acid. The data definitively show that the wavelength-dependent photochemistry of trans-urocanic acid results from the presence of two distinct, weakly coupled electronic states absorbing between 264 nm and 310 nm.
authors.affiliation: Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, USA.
authors.forename: K M
authors.initials: KM
authors.lastname: Hanson
authors.forename: J D
authors.initials: JD
authors.lastname: Simon
mesh_terms: D002151:Calorimetry / Q000379:methods; D013056:Spectrophotometry, Ultraviolet; D014560:Urocanic Acid / Q000528:radiation effects*
chemical_list: D014560:Urocanic Acid