Experimental Stark widths and shifts of two ultraviolet C(II) lines

Photoelectric measurements of Stark widths and shifts of the components of the C(II) multiplet UV13 at 2837 Å were made with a wall-stabilized arc in a gas mixture of argon, hydrogen and carbon dioxide. Plasma diagnostics have been carried out to determine the electron density and the temperature. For experiments performed under two different physical conditions, the values n_e(1) = 4.95 × 10¹⁶ cm^?3, T(1) = 11,430 K and n_e(2) = 6.78 × 10¹⁶ cm^?3, T(2) = 12,080 K were obtained. Agreement between our widths and experimental data of Plati?a et al. is within error limits; a discrepancy of a factor of 4 appears in a comparison of our data with those of Kusch.