EN
Half widths of 24 ArI lines from a wide interval of the spectrum and from a large range of excitation energies were measured. A wall-stabilized arc at atmospheric pressure was applied as a plasma generator. Electron densities of the plasma of the order of 10^{16}-10^{17} cm^{-3} were obtained on the basis of hydrogen H_{β} line broadening measurements. The measured widths of ArI lines, normalized to au electron density of 10^{16} cm^{-3} were compared with experimental data for analogous transitions in other noble atoms.