Electron-Impact Broadening of C II Spectral Lines

Abstract

Using semiclassical perturbation approach in the impact approximation, we have obtained Stark broadening parameters for 149 C II multiplets. Energy levels and oscillator strengths are taken from the TOPbase database. Results are obtained as a function of temperature, for a perturber densities of 1014,1017 and 1018 cm−3. In addition to electron-impact full half widths and shifts, Stark broadening parameters due to singly ionized carbon-impacts have been calculated, in order to provide Stark broadening data for the important charged perturbers in the atmospheres of carbon white dwarfs. The complete results will be published elsewhere, as well as the comparison to the existing experimental and other theoretical data. As an example of obtained results, we present data for a part of multiplets with wavelengths in the visible part of the spectrum.