Abstract
Abstract : The temperature of a SF6-He gas mixture in the plenum of a supersonic diffusion laser was measured by observing spectra of the HF(v) molecules when trace amounts of H2 were injected into the hot plenum gas. Because the plenum pressures were relatively high and the mean free path very short, rotational equilibrium was expected to be obtained. Thus, the rotational temperature obtained from the observed spectra was expected to equal the gas translational temperature. Precision of the temperature was + or - 10% largely because of the limited precision involved in the measurement of the slope of the intensity data. The observed values are about 10 to 36% higher than temperatures obtained from a pressure ratio method. This difference is probably because of the wall heat loss that occurs between plenum and throat, which was not taken into account in the pressure ratio method.
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