Voigt Profiles for the Barium Ion Resonance Line at 4934A.

Chemical releases in the upper atmosphere have become more quantitative with the use of barium which is ionized by solar irradiation. Optical measurements give the cloud size and motion. Attempts to use the hyperfine components of the odd mass isotopes is being pursued, since these components become optically thin sooner and closer to the release center than the unsplit line of the more abundant even mass isotopes. In this note, the authors provide the absorption cross section for the barium ion resonance line at 4934A which is of use in estimating the line density of Ba ions when the hyperfine components are optically thin. Author