Abstract
A method is described for detecting short‐lived charged primary products (ions, electrons) produced in photochemical reactions. The photochemical reaction is initiated by a light flash in an electric field of approximately 1000 v/cm. Photochemical changes produced in the solution are measured by a current impulse which occurs between the electrodes. The method is applicable for organic solutions which have a very small conductivity in the dark. Solvents such as hexane, benzene, and toluene may be used. The method was applied to detect light‐produced short‐lived radical ions of triphenylamine and similar substances in n‐hexane. The electrical detection of flash conductivity in the case of triphenylamine was examined optically by measuring the transient absorption band of the photoproduct by flash photometry.