Search for ion dynamics effects on the shift and width of plasma-broadened C i and O i spectral lines

Abstract

We report measured Stark shifts and widths of the neutral carbon 5052- and 4932-\AA{} lines and the neutral oxygen 4368-\AA{} line in the plasma of an atmospheric pressure wall stabilized electric arc. Electron densities of (1.4--3.1)\ifmmode\times\else\texttimes\fi{}${10}^{16}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$ are measured from the width of the ${\mathrm{H}}_{\mathrm{\ensuremath{\beta}}}$ line while electron and gas temperatures in the range from 9300 to 10 300 K are determined from plasma composition data. Experimental Stark widths and shifts are compared to theoretical results obtained from semiclassical calculations of Stark broadening parameters using quasistatic and ion-dynamic treatment of the ions. Some indications are found that the inclusion of ion dynamics in the calculation of the shifts of the C i 5052-\AA{} line slightly improves the consistency between theory and experiment.