Electron impact excitation collision strength for transitions in C II

Details Electron impact excitation collision strength for transitions in C II Electron impact excitation collision strength for transitions in C II

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...486..629t&link_type=abstract

Astronomy and Astrophysics, Volume 486, Issue 2, 2008, pp.629-636

Astronomy and Astrophysics

Astrophysics

3

Atomic Data, Atomic Processes

Scientific paper

Aims: Oscillator strengths and electron impact excitation collision strengths for C II lines among the fine-structure levels are calculated. Thermally averaged collision strengths are presented as a function of electron temperature for application to astrophysical plasmas. Methods: An accurate description of the target wave functions has been obtained in the multiconfiguration Hartree-Fock approach with flexible non-orthogonal orbitals. The 42 fine-structure levels of the 2s^22p, 2s2p^2, 2s^23l (l = 0-2), 2p^3, 2s^24l (l = 0-3), 2s2p3s and 2s^25l (l = 0-2) configurations have been included in the scattering calculation. A second calculation with lowest 35 levels in the close-coupling expansion has also been carried out to check channel coupling effects on collision strengths. The continuum functions have been represented by the use of B-spline basis. The B-spline R-matrix method in the framework of Breit-Pauli approximation has been used to investigate the electron impact excitation of forbidden and allowed transitions in C II. Results: The present cross sections for the resonance ^2P°-2s2p^2~^2D, ^2S and intercombination ^2P°-2s2p2 ^4P transitions are in very good agreement with the electron energy-loss merged-beams experiment. Oscillator strengths and transition probabilities for C II lines normally compare very well with previous calculation. The effective collision strengths are obtained by integrating total resonant and non-resonant collision strengths over a Maxwellian distribution of electron energies and these are presented over a wide temperature range suitable for modeling of astrophysical plasmas. Our effective collision strengths show significant differences with those from previous calculations for transitions involving higher excitation levels.
Tables 4 and 5 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/486/629

Affiliated with

Also associated with

No associations

Rating

Electron impact excitation collision strength for transitions in C II 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 Electron impact excitation collision strength for transitions in C II, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electron impact excitation collision strength for transitions in C II will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1169683