Abstract
The radial distributions of the temperature and particle density are of decisive importance for the understanding of high-pressure gas discharges. The present paper deals with the measurement of radial density profiles of the excited Hg states 6, 6 and 6 and the determination of the temperature profiles in conventional 250 W high-pressure Hg and discharge lamps. The population densities are determined using the interferometric hook method and the arc temperature by emission spectroscopy. From the density distribution the radial temperature profiles are deduced. They agree well with those determined by emission spectroscopy. It is demonstrated that the hook method is also applicable to such discharges sustained in cylindrical discharge tubes which are usually not very suitable for interferometric measurements.
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