Abstract
The collisional self-broadening and shift of neutral argon spectral lines have been determined as a function of atom density $N$ for several lines terminating on either the lower resonance or lower metastable levels. The lines were emitted by a variable-pressure discharge tube equipped with intracapillary thermocouples, and were observed using a pressure-scanned Fabry-Perot interferometer. The line profiles were analyzed using a least-squares fit of Whiting's Voigt function to all profile intensity points. Particular attention was given to the determination of the gas temperature, from which $N$ was calculated. The contribution of nonresonant interactions to the broadening and shift of lines connected to the ground state via resonant transitions was examined using the analysis of Lewis.
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