Time dependence of donor-acceptor electron transfer. Solid solution

✍ Scribed by M.S. Mikhelashvili; J. Feitelson; M. Dodu

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 481 KB
• Volume: 171
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(90)85266-f

✦ Synopsis

Electron transfer from optically excited donor molecules, D*, to randomly distributed acceptor molecules, A (D* t A+D+ t A-), followed by the back reaction (D+ + A-+D+A), is treated theoretically for a solid solution. An expression for the average donor cation probability, P+ (1 ), is derived by the adaptation of two different methods used previously to describe the transfer of electronic excitation energy in solution. Calculations of the time dependence for P+ ( f ) are presented as curves showing its dependence on acceptor concentration and rate constants for the forward and back reactions. The results indicate that the maximal value of P+ ( t) increases with acceptor concentration and with the rate of the forward electron transfer while it decreases with the rate of the back transfer.