A variational theory of the radiant emittance of the mercury‐argon discharge is developed and applied to an investigation of the effects of alterations of the isotopic composition of the mercury. The theory includes the effects of transport of resonance radiation, elastic and inelastic collisions, resonant exchange of excitation, diffusion of the mercury atoms, the isotope‐ and hyperfine‐shifted structure of the resonance line, and the surfaces of the discharge on the emittance. Two sensitive parameters—the branching ratio for radiative decay of the resonance state and the rate constant for resonant exchange of excitation—are fitted to data on natural mercury. The remaining insensitive parameters are given values based on microscopic estimates. The resulting theory reproduces the experimentally observed results for mercury—196 enhanced mixtures. We predict small effects for mixtures with other isotopes enhanced. The crucial role played by resonant exchange of excitation is emphasized.

%B Journal of Applied Physics %V 72 %P 5571-5578 %8 12/1992 %G eng %N 12 %1Lighting Systems Group

%2 LBL-31020 Rev. %& 5571 %R 10.1063/1.351956 %0 Journal Article %J Journal of Quantitative Spectroscopy and Radiation Transfer %D 1986 %T Determination of the Excited State Density of an Optically Thick Line %A Sam M. Berman %A Robert W. Richardson %XThe transverse profile of the monochromatic radiance of an optically thick resonance line from a cylindrical discharge is inverted exactly to give the radial distribution of radiating atoms. In contrast to the Abel transform, this result is valid for all optical depths.

%B Journal of Quantitative Spectroscopy and Radiation Transfer %V 37 %P 471-475 %G eng %L LBL-21475 %1Lighting Systems Group

%2 LBL-21475 %0 Journal Article %J Journal of the Illuminating Engineering Society %D 1986 %T Magnetic Enhancement of Ultraviolet Radiation Efficiency of Low Pressure Hg-Ar Discharge %A T. Zhou %A L. Wang %A Donald D. Hollister %A Sam M. Berman %A Robert W. Richardson %B Journal of the Illuminating Engineering Society %V 16 %P 176-181 %8 07/1986 %G eng %N 1 %1Lighting Systems Group

%2 LBL-22360 %& 176 %R 10.1080/00994480.1987.10748677 %0 Conference Paper %B 3rd International Symposium on the Science and Technology of Light Sources %D 1983 %T Experimental Studies of Enhanced Emittance by Zeeman Splitting of a Low-Pressure Mercury/Argon Discharge %A Robert W. Richardson %A Sam M. Berman %B 3rd International Symposium on the Science and Technology of Light Sources %C Toulouse, France %8 04/1983 %G eng %L LBL-17394 %1Lighting Systems Group

%2 LBL-17394