Abstract
Abstract The vertical distribution of neutral CO2, O2, CO and O gases on Venus has been calculated, photochemical equilibrium being assumed. Kaplan's model of the atmospheric structure is adopted; and the solar ultraviolet radiation in the wavelengths from 1250 to 1950 A is assumed to be that of a 5000°K black body. It is found that the radiation is absorbed mainly by O2 molecules produced by three body recombination between O atoms. In consequence the altitude of the dissociation layer on Venus is higher than was derived earlier by taking into account the dissociation of CO2 molecules only. The calculated amounts of CO, O and O2 on Venus are 4, 4, 0.1 cm STP respectively.
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