Abstract
Spontaneously emitted atomic line shapes from an argon ion laser discharge have been measured with a plane parallel Fabry-Perot interferometer. The interferometer and its associated data reduction programs were carefully characterized so that Lorentzian widths on the order of 0.004 of the interferometer free spectral range could be measured. The observed line shapes were analyzed in terms of thermal Doppler broadening, Stark broadening by electrons and natural broadening. Electron densities calculated from the Stark broadening were discrepant by factors of 5–10. An alternative line-shape model, which includes a non-thermal velocity distribution function, is proposed.
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