Stark shift of the CI 2479 Å spectral line of carbon

Abstract

The Stark shift of the CI 2479 Å emission line of atomic carbon is measured in a broad range of electron densities between ~6 × 10¹⁶ and ~4 × 10¹⁸ cm^–3. It is established that the shift is linear and its value is significantly lower than that predicted by theory. The line shape is found to be dominated by the Stark effect at Т = 32 kK and electron concentration N_e ≈ 3.9 × 10¹⁸ cm^–3. The electron-impact and ion widths of this contour are in good agreement with the Grim data, while its total shift to longer wavelengths is found to be half that calculated theoretically.