:—Behaviors of dinitrogen monoxide and nitrogen monoxide in the photo-reaction in N<SUB>2</SUB>O-NO<SUB>x</SUB>-air mixture—
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The behaviors of N<SUB>2</SUB>O and NO<SUB>x</SUB> in the photo-reaction in N<SUB>2</SUB>O-NO<SUB>x</SUB>-N<SUB>2</SUB> and N<SUB>2</SUB>O-NO<SUB>x</SUB>-air mixtures were studied. N<SUB>2</SUB>O was not changed by the presence of NO, NO<SUB>2</SUB> and O<SUB>3</SUB> and not affected by the UV irradiation with high pressure mercuy lamp. N<SUB>2</SUB>O decomposed to N<SUB>2</SUB> and O<SUB>2</SUB> under the UV irradiation with low pressure mercury lamp and the decomposition rate was proportional to the concet-ration of N<SUB>2</SUB>O. The reaction was not affected by NO, NO<SUB>2</SUB> and O<SUB>3</SUB>. NO in N<SUB>2</SUB>O-NO-N<SUB>2</SUB> mixture did not change under the UV irradiation with high pressure mercury lamp, while decomposed to N<SUB>2</SUB> and O<SUB>2</SUB> under the irradiation with low pressure mercury lamp and the decomposition was accelerated a little by O<SUB>2</SUB> formed by the decomposition in N<SUB>2</SUB>O. NO in air was oxidized to NO<SUB>2</SUB> under the dark reaction, while did not change under the irradiation with high pressure mercury lamp because of the formation of NO by the photo-decomposition of NO<SUB>2</SUB>. NO was photo-oxidized by the UV irradiation with low pressure mercury lamp. All of these reactions of N<SUB>2</SUB>O-NO-air mixtue were not at-fected by N<SUB>2</SUB>O. NO<SUB>2</SUB> in N<SUB>2</SUB> did not change in the dark reaction and decomposed to NO and O<SUB>2</SUB> with high pressure mercury lamp irradiation. NO<SUB>2</SUB> decomposed to NO and reduced partially to N<SUB>2</SUB> by the low pressure mercury lamp irradiation. The rates of these reactions were same with those in the presence of N<SUB>2</SUB>O. NO<SUB>2</SUB> in air decomposed to NO and O<SUB>2</SUB> by the high pressure mercury lamp irradiation and was oxidized to higher oxides by the low pressure mercury lamp irradiation. These reaction rates were not change the presence of N<SUB>2</SUB>O,
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