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Proposed mechanism for conPET in rhodamine 6G. After excitation of the radical R6G. with light of 420 nm, the excited state decays very quickly (0.35 ps) back to the ground state of the radical or transfers an electron to the solvent. R6G+ and R6G. are produced with some thermal energy and cool on a timescale of 10 ps. R6G+ recaptures the electron on a timescale of several nanoseconds.
