The light emitting reaction NO+O→NO2+hv is shown to be second order in the pressure region of 3 to 20 μ. This would indicate that the major source of emission is a simple radiative combination of nitric oxide and oxygen atoms. In addition, any excitation and emission mechanism involving a third body would be too small to account for the light emission observed.
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Reeves et al. (1964) studied this question.
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