A determination of the nitric oxide Einstein coefficient ratios

Computer Science

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Electron Irradiation, Molecular Excitation, Molecular Relaxation, Nitric Oxide, Vibrational Spectra, Atmospheric Chemistry, Curve Fitting, Electron Transitions, Fluorescence, Gas Mixtures, Infrared Radiation, Michelson Interferometers, Molecular Absorption, Molecular Rotation

Scientific paper

The fluorescent emission from electron-irradiated mixtures of N2 with trace O2 has been spectrally resolved by means of a Michelson interferometer. The total fundamental and overtone emission from NO could be observed by the use of three different detectors. NO emission dominated the IR fluorescence and exhibited emission from molecules with up to 10 quanta of vibrational excitation. The use of an indium antimonide detector made it possible to obtain the relative intensities in both NO bands. Fitting of the data with computer-generated spectra made it possible to determine the quantity NvAv-v-n for all v not greater than 9 and n = 1, 2 as a function of time during electron irradiation. Steady state values of this quantity were averaged and ratioed to give the first experimental measurements of the ratio of NO Einstein coefficients Av-v-2/Av-v-1.

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