Photocurrent kinetics at the electron emission from a metal into electrolyte solution Part II. Solutions without acceptors and solutions of N2O, NO2−, NO3−

Abstract

A method of measuring the kinetics of currents arising at the electron photoemission from a metal into electrolyte solution when affected by the u.v. laser pulses for 10 −8 s at the frequency of repetitions 10–25 Hz is described. Measurements have been taken in solutions without acceptors and in those containing N 2 O and NO 2 − , NO 3 − ions as electron acceptors. The rate constants of capture of the solvated electrons by N 2 O ((6±1)×0 9 mol −1 s −1 ) and NO 2 − ((4.5±1)×10 9 mol −1 s −1 ) and the diffusion coefficients of OH-radicals ((1.0±0.3)×10 −5 cm 2 s −1 ) and of NO ((1.2±0.3)×10 −5 cm 2 s −1 ) are found. The oxidation rate of NO 3 2− has been shown to decrease from 40 cm s −1 in the range of potentials −0.55 to −1.0 V. The rate constant of bimolecular recombination of the solvated electrons ((1.3±0.4)×10 10 mol −1 s −1 ) has been found from the dependence of the emitted charge on the light intensity.