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MEASUREMENT OF ROTATIONAL TEMPERATURE, VIBRATIONAL TEMPERATURE, AND MOLECULE CONCENTRATION, IN NONRADIATING FLOWS OF LOW DENSITY NITROGEN
TORONTO UNIV (ONTARIO) INST FOR AEROSPACE STUDIES
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A method was developed for measuring rotational temperature, vibrational temperature, and molecule concentration, in nonradiating flows of low density nitrogen. The method involves the passing of a narrow beam of high energy electrons through the flow. The beam electrons excite a relatively strong emission from the first negative system of the nitrogen molecular ion N2. The rotational and vibrational temperatures, as well as number density, of the ground state nitrogen molecules can be inferred from observations of the beam excited first negative system. Particular emphasis was placed on the measurement of rotational temperature. A theoretical prediction was made of the relative intensities of the rotational lines in the first negative system. The prediction of the relative intensities, as a function of the rotational temperature of the ground state molecules, was checked experimentally and found to apply to within the accuracy of the experiments or -2 for rotational temperature measurements. Author
APPROVED FOR PUBLIC RELEASE