Shock Tube Rotational Relaxation Measurements in Low-Temperature Hydrogen

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Abstract
Rotational relaxation times are measured for normal hydrogen and parahydrogen in a cryogenic shock tube with initial temperatures of 80–100°K. A sensitive schlieren optical system, employing a laser light source and a photomultiplier, is used to measure laboratory relaxation times of the order of 0.1 μsec, with a spatial resolution of 0.1 mm. Measurements are made over a temperature range of 140–450°K. Relaxation times are in general agreement with results obtained by other methods.

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