Abstract
Recent results on the formation of ozone from oxygen photosensitized by mercury vapor at 2537 A show that the effects of foreign gases on deactivating the excited state of oxygen formed by energy transfer are He, A, N2, and CO2 in order of increasing efficiency. However the efficiencies of A and N2 are about the same. Consideration of the process of deactivation by collision indicate that the 3Σu+ state of O2 is not the excited state involved, and that the excited state is vibrationally excited O2 in the ground state, 3Σg−. Analogous arguments applied to the unsensitized reactions at 1849 A, where the effects of the added gases are in opposite order, show that after the absorption of light predissociation occurs from the 3Σu− state of O2.
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