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Transport of charges, liberated by light in crystalline pigments (chlorophyll, methylchlorophyllide, haemin, the phthalocyanines) has been studied and their sign determined with two condenser methods. The positive carriers of photoconduction imply an oxidation-reduction intermolecular exchange of electron at the ground levels. Sensitization of the photoelectric effect in inorganic semiconductors by adsorbed pigments has been studied and interpreted as energy transfer. A light-induced proton exchange in layers of amphoteric acridine derivatives has been observed in fluorescence at low temperature, as an extension of a previous work on acridine in a matrix of organic acids in vacuo.* Spectral band pass from 10 to 1 mp and incident energy from 10-3 to 10-5 W cm-2 t We use further the abbreviation " ph-e.m.f." for this method.1 It has been recognized that the Bergmann condenser method can give reliable results 9 Spectral band pass from 5 mp (at 700 mp) to 0.6 mp (at 400 mp) ; incident energy at 700 and 400 mp respectively. for a single type of charge carriers only. 9 x 10-5 to 3 x 10-7 W cm-2, respectively.

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