Add time:07/28/2019 Source:sciencedirect.com
Time-resolved resonance Raman spectra are obtained for the lowest excited triplet state T1 and the radical cation of 5-dibenzosuberenol (DBCH-5-ol). It is concluded, based on the large downshifts of the Raman bands assignable to the CC stretch of the central ring, that the CC bond is weakened markedly both in the T1 state and in the radical cation; the weakening is much more pronounced in the T1 state. Dependence on the intensity and wavelength of the pump laser pulse indicates that the production of the radical cation is biphotonic via the S1 state and that the intersystem crossing from S1 to T1 is much slower from low vibrational levels than from higher vibrational levels, resulting in the very small yield of the T1 state when photolysed by 340 nm UV light.
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