Abstract
Rotational temperatures are determined by measuring the absorption of infrared laser radiation. The possibilities of this method are critically examined and tested. As a result the molecular density in the expansion could be determined, too. Color-center laser radiation has been absorbed by a molecular jet of NH3. An anomalous line shape has been observed, related to a Doppler shift from molecules moving along the various streamlines. No deviations from a thermal rotational distribution have been observed.
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Work supported by Stichting voor Fundamenteel Onderzoek der Materie (F.O.M.)
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Veeken, K., Reuss, J. Determination of the rotational temperature and the molecular density in an expanding NH3 jet by infrared absorption. Appl. Phys. B 34, 149–159 (1984). https://doi.org/10.1007/BF00697508
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DOI: https://doi.org/10.1007/BF00697508