Abstract
Naphthacene and fluoranthene in hexane showed photoconductivity signals upon excitation by 458-nm irradiation (200 mW) with a continuous-wave argon ion laser. The signals were quadratically proportional to the laser power and linearly proportional to the solute concentration, indicating a two-photon excitation-ionization. By evaluation of the signal intensity and laser beam parameters, two-photon ionization cross sections for the production of the free ions separating from geminate ion-electron pairs have been determined absolutely to be 2.2×10 -52 and 2.5×10 -54 cm 4 s/(molecule photon) for naphthacene and fluoranthene, resistively, at an electric field of 5000 V/cm. The former cross section of the ionization via a real state was about 100 times larger than the latter via a virtual state
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