Abstract
Two laser techniques are used to measure densities of mercury atoms in the three 63PJ states populated in the positive column of a narrow (13.7 mm diameter) low-pressure Hg-Ar dc discharge. Relative densities are obtained as a function of radial position using a saturated laser absorption technique, while on-axis absolute densities are measured using the hook method (an interferometric technique). Results are shown for two mercury vapor pressures and are compared with computer model predictions.
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