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An experimental test of the additivity of perturbation energies produced by collisions of the radiating atom with perturbers is made by measuring the Lorentzian half-width of the 632.8 nm line of Nel under various pressures and with various concentration ratios of a mixture of Ne and He. The Lorentzian half-width produced by the mixture is found to be the sum of half-widths due to each component gas

Broadening Effects of the 632.8 nm Nel Line Due to a Helium-Neon Mixture