“…The time scales given by Equation ( 10) control the chaotic dynamics of the transient state of elementary electron transfers in condensed media. They are discussed in [28,29,32,33,35,[48][49][50]. The donor-acceptor distance L is also equal to the length of the polymethine chain, the main optical chromophore of polymethine dyes, where the electronic charge on carbon atoms alternates along the chain and alternatively redistributes upon optical excitation; therefore, in Equations ( 21) and ( 22), we can often take η ≈ 1 [28][29][30][31][32][33][34]40].…”