Lamps and wavelengths of mercury 198

Abstract

The production and extraction of artificiall~gHg from l~~Au bombarded by neutrons is described, and the procedure in making electrodeless lamps with l~gHg is given in detail. These lamps are excited by high-frequency radio waves; they emit the mercury spectrum entirely free from isotope shifts and hyperfine structures that characterize natural mercury. Fabry-Perot interferometers and a prism spectrograph were employed for measuring, relative to Cd 6438.4696 angstroms, the wavelengths of the stronger lines in the visible spectrum of l~gHg. Preliminary values for l~gHg radiations in normal air are reported as 5790.