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.

1 aRichardson, Robert, W.1 aBerman, Sam, M. uhttps://buildings.lbl.gov/publications/variational-theory-radiant-emittance00771nas a2200145 4500008004100000050001400041245007400055210006900129300001200198490000700210520028200217100002000499700002700519856007900546 1986 eng d aLBL-2147500aDetermination of the Excited State Density of an Optically Thick Line0 aDetermination of the Excited State Density of an Optically Thick a471-4750 v373 aThe 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.

1 aBerman, Sam, M.1 aRichardson, Robert, W. uhttps://buildings.lbl.gov/publications/determination-excited-state-density00579nas a2200169 4500008004100000245009300041210006900134260001200203300001200215490000700227100001300234700001300247700002600260700002000286700002700306856007600333 1986 eng d00aMagnetic Enhancement of Ultraviolet Radiation Efficiency of Low Pressure Hg-Ar Discharge0 aMagnetic Enhancement of Ultraviolet Radiation Efficiency of Low c07/1986 a176-1810 v161 aZhou, T.1 aWang, L.1 aHollister, Donald, D.1 aBerman, Sam, M.1 aRichardson, Robert, W. uhttps://buildings.lbl.gov/publications/magnetic-enhancement-ultraviolet00505nas a2200121 4500008004100000050001400041245010900055210006900164260003000233100002700263700002000290856007300310 1983 eng d aLBL-1739400aExperimental Studies of Enhanced Emittance by Zeeman Splitting of a Low-Pressure Mercury/Argon Discharge0 aExperimental Studies of Enhanced Emittance by Zeeman Splitting o aToulouse, Francec04/19831 aRichardson, Robert, W.1 aBerman, Sam, M. uhttps://buildings.lbl.gov/publications/experimental-studies-enhanced