Investigation of the peculiarities of the photoconductivity of
an anthracene cathode in the redox system iodine-iodide has supplied
information on the kinetics of photoelectrochemical reactions
injecting holes into anthracene. The effect of the surface coverage
of anthracene with adsorbed iodine, the dielectric constant of the
solvent, and of the energy of exciting photons on the photoconductivity
of an anthracene cathode has been studied. It is shown
that at photon energies from 3.8 to 5.0 eV, greater than the forbidden
zone width, the conduction band electrons participate in the
iodine reduction reaction. In the spectral region of singlet absorption
of anthracene, excitons participate in the electrochemical charge
separation reaction. In the case of contact with a polar solvent,
excitons break up at the surface levels formed by adsorbed iodine.
In the case of contact with a weakly-polar solvent, excitation is
transferred to adsorbed iodine. In the spectral region of weak
optical absorption of anthracene, iodine particles excited directly
by the light that had passed through the crystal participate in
the reaction
