Effective collision strengths for fine-structure forbidden transitions among the 2s22p3 levels of S x

K. L. Bell*, C. A. Ramsbottom

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)677-682
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - 21 Sep 1999


  • Atomic processes
  • Line: formation

ASJC Scopus subject areas

  • Space and Planetary Science


Dive into the research topics of 'Effective collision strengths for fine-structure forbidden transitions among the 2s<sup>2</sup>2p<sup>3</sup> levels of S x'. Together they form a unique fingerprint.

Cite this