The lowest excited triplet (T1) state of the most widely used UV-B absorber, octyl methoxycinnamate (OMC), has been studied through measurements of phosphorescence and electron paramagnetic resonance spectra in rigid solutions at 77 K. The energy level and lifetime of the T1 state of OMC were determined. The observed T1 lifetime and zero-field splitting parameter suggest that OMC possesses mainly a 3ππ* character in the T1 state.
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Kikuchi et al. (2010) studied this question.
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