Abstract
Resonance broadening of the 7281 and 6678 Å He lines emitted from a gas discharge at pressures around 1 atm has been measured at a temperature of about 500 K. Temperatures in the discharge were obtained by recording the intensity distribution of the 3Π g → 3Σ + u (υ′ = 0,υ″ = 0) band of He 2 at 4650 Å and the 2Σ + u → 2Σ + g (υ′ = 0,υ″ = 0) band of N 2 + at 3914 Å. Analysis of the asymmetry of the He line profiles shows that the impact approximation is no longer a valid description of the collision process at the He densities encountered in this experiment. The self broadening constant of the 2 1 P state in He was derived from the widths of the resonance-broadened profiles after correction for residual van der Waals broadening.
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