PHOTO‐CHEMILUMINESCENT EMISSION IN OZONE

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Abstract
Abstract— Photo‐chemiluminescence is the phenomenon of radiation from a chemiluminescent reaction in which one or more of the reactants are formed initially by a photochemical process. Such photo‐chemiluminest emission has been observed, using a flow apparatus designed for the purpose, in ozne prepared from cylinder oxygen. The emission is shown to be identical with that observed from the reaction of nitric oxide with ozone. The ultimate source of the emission is taken to be the activation in the ozonizer of nitrogen, present as a trace impurity in the oxygen; nitrogen pentoxide is the oxide of nitrogen expected to be formed in the presence of ozone. Photolysis of ozone forms atomic oxygen which reacts with nitrogen pentoxide to yield nitric oxide which subsequently enters into the chemiluminescent reaction with ozone. (Experiments are described which confirm that nitric oxide is one of the products of the reaction between atomic oxygen and nitrogen pentoxide). The variation of emitted intensity with total gas pressure, ozone concentration and linear flow velocity is shown to be consistent with the mechanism proposed.No emission could be detected from either O2(1δg) or O2(1σ+g), which are possible products of the ozone photolysis. It is shown that while the absence of radiation from the 1σ+g; state indicates that O2(1σ+g) is not present in our system, yet the apparatus is not sufficiently sensitive in its present form to detect radiation from O2(lδg).

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