Abstract
Experimental results of Stark broadening and shift of two neutral helium lines, 3889 and 5876 A, in hydrogen‐helium, pure helium and argon‐helium plasmas are reported. Experimental Stark widths and shifts are compared with theoretical results obtained from three sets of semiclassical calculations of Stark‐broadening parameters using quasistatic and ion‐dynamic treatment of ions. Accounting for ion dynamics in the calculation of widths and shifts considerably improves the agreement between theory and experiments. The comparison shows a constant systematic descrepancy between the semiclassical calculations and experiment. These results suggest the feasibility of plasma‐electron‐density determination with a precision of 3–5%. A simple parametric expression that closely approximates the ion dynamic contribution to the shift of isolated lines is derived from the unified theory by Barnard, Cooper and Smith.
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