The Luminosity of Mercury Vapor Distilled from the Arc in Vacuo.

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Abstract
Afterglow of Mercury Vapor from an Arc in Vacuum.—(1) The effect of an electric field on the spectrum was studied. It was found that charged grids decreased the luminosity without changing the color; but when, under certain conditions, the luminosity was increased, there was a change in the relative intensity of the lines. (2) The velocity of the vapor was measured by a stroboscopic method. The luminosity was decreased intermittently at a known frequency and the resulting "puffs" as they moved along the tube, were observed stroboscopically. From this velocity and the rate of distillation, the density of the vapor was computed. (3) Decay of luminosity along the tube was observed. (4) Theoretical discussion of these results leads to the conclusion that recombination of the positive and negative ions produced by the discharge, is the most probable cause of the afterglow.

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