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.
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Hanson et al. (1998) studied this question.
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