Spatial distribution of electrons ejected by two-photon excitation of aromatic molecules in polymer systems

The spatial distribution of electron-cation pairs formed in polymer films t hrough two-photon ionization of aromatic dopants was evaluated from the dec ay of charge recombination luminescence at 20 K according to Hama's theory. The distribution was also examined directly using a layer-structure of ult rathin polymer films where the separation distance between donor and accept or moiety was controlled on a nanometer scale. The results in both systems show that electrons ejected by two-photon ionization are distributed over 3 0 Angstrom away from the parent cations. (C) 2001 Elsevier Science Ltd. All rights reserved.