Measurements of the ionised silicon multiplet (1) Stark parameters by two different methods.

Physics

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Stark Broadening: Silicon Lines, Stark Broadening: Line Profiles

Scientific paper

Line profiles of the λ = 3862, 3856 and 3854 Å lines have been measured in a conventional shock tube. For the weak λ = 3854 Å line, a new deconvolution method provides the first measurement of its Stark width. Electron densities vary in the range 0.5-2.0×1023m-3, and temperatures from 11,000 to 14,500 K. The Stark effect is the dominant broadening mechanism. Two different methods of line-profile recording and deconvolution are used to obtain the Stark parameters. The broadening constant for all lines of the multiplet has the same value, i.e., 0.56 Å/1023m-3 ±10%. No significant temperature dependence could be detected. For all lines a small blue shift was measured. Present measurements discriminate between earlier experimental and theoretical results, which disagreed by a factor of two.

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