Abstract
The intensity of the spontaneous radiation emitted behind a normal shock wave is measured in a free-piston shock tube, at a velocity of 5.8 km/s. The shocked test gas is a N 2CH 4 mixture at an initial pressure of 2 mbar. The time-dependent spontaneous emission of CN molecules, for the B 2 Σ + → X 2 Σ + electronic transition, is recorded on three different wavelengths in the same shot. The rotational and vibrational temperature evolutions are deduced from a comparison between measured and calculated intensities in the Δv = 0 band.
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