Semi-classical Stark broadening calculations of HeI lines in a non-ideal plasma

Details Semi-classical Stark broadening calculations of HeI lines in a non-ideal plasma Semi-classical Stark broadening calculations of HeI lines in a non-ideal plasma

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...465..651b&link_type=abstract

Astronomy and Astrophysics, Volume 465, Issue 2, April II 2007, pp.651-665

Astronomy and Astrophysics

Astrophysics

1

Atomic Data, Line: Profiles, Atomic Processes

Scientific paper

New semi-classical collision functions are used to compute the inelastic contribution to the impact electronic total width, by considering three interaction potentials (Coulomb Debye, Cut-off, and Ion Sphere). Numerical results are calculated for the neutral helium 6678 Å (21P°-31D) and 5876 Å (23P°-33D) visible lines. The lines corresponding to these transitions are isolated, and the plasma is weakly non-ideal for all temperatures and electronic densities of interest. For electronic collisions, semi-classical perturbation theory is sufficient and the impact approximation is well satisfied. The ion effects can be treated within the quasistatic approximation, and the quasistatic ionic contribution is dominated by the polarization (or quadratic) r_p-4-interaction. To consider both the electron and the ion effects, the microfield distributions and the complete reduced Stark profile of isolated line are calculated using different methods. The computed total widths corresponding to the three interaction potentials are compared to the available experimental widths and then approximated by appropriate formulae. The data we obtained provide an opportunity to test various approximations included in the semi-classical perturbation formalism. They are also of interest for stellar spectroscopic diagnosis in dense atmospheres (white dwarfs for instance).

Affiliated with

Also associated with

No associations

Rating

Semi-classical Stark broadening calculations of HeI lines in a non-ideal plasma does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Semi-classical Stark broadening calculations of HeI lines in a non-ideal plasma, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Semi-classical Stark broadening calculations of HeI lines in a non-ideal plasma will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1679808