Diffusion-controlled intermolecular electron transfer studied by transient absorption and degenerate four-wave mixing measurements

The time dependence of intermolecular electron transfer kinetics is studied by two experimental techniques: transient absorption measurements and degenerate four-wave mixing after excitation of the donor molecules by picosecond UV pulses. In the system perylene/phthalic anhydride the electron transfer rate depends strongly on the concentration of the acceptor molecule phthalic anhydride. The value agrees with theoretical calculations based on a diffusion-controlled process.