Effective collision strengths for forbidden transitions among the 3s23p3 fine-structure levels of CL IIIIII

Details Effective collision strengths for forbidden transitions among the 3s23p3 fine-structure levels of CL IIIIII Effective collision strengths for forbidden transitions among the 3s23p3 fine-structure levels of CL IIIIII

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.307..669r&link_type=abstract

Monthly Notices, Volume 307, Issue 3, pp. 669-676.

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Scientific paper

Effective collision strengths for the 10 astrophysically important fine-structure forbidden transitions among the ^4S^o, ^2D^o and ^2P^o levels in the 3s^23p^3 configuration of Cliii are presented. The calculation employs the multichannel R-matrix method to compute the electron-impact excitation collision strengths in a close-coupling expansion, which incorporates the lowest 23 LS target eigenstates of Cliii. These states are formed from the 3s^23p^3, 3s3p^4, 3s^23p^23d and 3s^23p^24s configurations. The Maxwellian-averaged effective collision strengths are presented graphically for all 10 fine-structure transitions over a wide range of electron temperatures appropriate for astrophysical applications [logT(K)=3.3-logT(K)=5.9]. Comparisons are made with the earlier seven-state close-coupling calculation of Butler & Zeippen, and in general excellent agreement is found in the low-temperature region where a comparison is possible [logT(K)=3.3-logT(K)=4.7]. However, discrepancies of up to 30 per cent are found to occur for the forbidden transitions which involve the ^4S^o ground state level, particularly for the lowest temperatures considered. At the higher temperatures, the present data are the only reliable results currently available.

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