Effective collision strengths for election impact excitation of Cl III

C. A. Ramsbottom*, K. L. Bell, F. P. Keenan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Effective collision strengths for electron-impact excitation of the phosphorus-like ion Cl III are presented for all fine-structure transitions among the levels arising from the lowest 23 LS states. The collisional cross sections are computed in the multichannel close-coupling R-matrix approximation, where sophisticated configuration-interaction wave functions are used to represent the target states. The 23 LS states are formed from the basis configurations 3s23p3, 3s3p4, 3s23p23d, and 3s23p24s, and correspond to 49 fine-structure levels, leading to a total possible 1176 fine-structure transitions. The effective collision strengths, obtained by averaging the electron collision strengths over a Maxwellian distribution of electron velocities, are tabulated in this paper for all 1176 transitions and for electron temperatures in the ranges T(K)=7500-25,000 and log T(K)=4.4-5.4. The former range encompasses the temperatures of particular importance for application to gaseous nebulae, while the latter range is more applicable to the study of solar and laboratory-type plasmas.

Original languageEnglish
Pages (from-to)57-85
Number of pages29
JournalAtomic Data and Nuclear Data Tables
Issue number1
Publication statusPublished - Jan 2001

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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