Linewidths and shifts of the five prominent visible Si II multiplets are measured in a conventional shock tube. The Stark effect from impacting plasma electrons is the dominant broadening mechanism. Electron densities range widely [(4-15) ×{} 10¹⁶ cm^-3], but temperatures (9500-12 500^∘{}K) do not. Optical depth and source inhomogeneity are rarely troublesome. Depending upon interference, blending, and signal-to-noise ratios, broadening-parameter accuracies are between 15-25% and shift uncertainties are 15-100%. Comparison data are examined.
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Lesage et al. (1977) studied this question.
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