Effective collision strengths for electron-impact excitation of the N-like ion S x are calculated in the close-coupling approximation using the multichannel R-matrix method. Specific attention is given to the 10 astrophysically important fine-structure forbidden transitions among the 4SO, 2Do and 2Po levels in the 2s22p3 ground configuration. The total (e- + ion) wavefunction is expanded in terms of the 11 lowest LS eigenstates of S x, and each eigenstate is represented by extensive configuration-interaction wavefunctions. The collision strengths obtained are thermally averaged over a Maxwellian distribution of velocities, for all 10 fine-structure transitions, over the range of electron temperatures log T(K) = 4.6-6.7 (the range appropriate for astrophysical applications). The present effective collision strengths are the only results currently available for these fine-structure transition rates.
|Number of pages||6|
|Journal||Monthly Notices of the Royal Astronomical Society|
|Publication status||Published - 21 Sep 1999|
- Atomic processes
- Line: formation
ASJC Scopus subject areas
- Space and Planetary Science