Abstract
The dynamics and spectroscopic characteristics of the ultrafast photoinduced electron transfer (ET) of Rhodamine 6G (Rh6G+) in N,N-diethylaniline (DEA) were studied using femtosecond time-resolved multiplex transient grating and transient absorption spectroscopies. The ultrafast photoinduced forward ET from DEA to the Rh6G+* cation radical excited state has a time constant of τFET = 219–318 fs. The much slower backward ET from the neutral radical Rh6G· to DEA+ with a time constant of τBET = 22.76–42.31 ps occurs in the inverted region. Intramolecular vibrational relaxation of the excited state takes place in τIVR = 2.18–6.91 ps.
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