SEARCH FOR ION DYNAMICS EFFECTS ON THE SHIFT AND WIDTH OF PLASMA-BROADENED CI AND OI SPECTRAL-LINES

We report measured Stark shifts and widths of the neutral carbon 5052- and 4932-Å lines and the neutral oxygen 4368-Å line in the plasma of an atmospheric pressure wall stabilized electric arc. Electron densities of (1.4-3.1)×1016 cm-3 are measured from the width of the Hβ 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-Å line slightly improves the consistency between theory and experiment. © 1995 The American Physical Society.