Effective collision strengths for electron impact excitation of C II

Details Effective collision strengths for electron impact excitation of C II Effective collision strengths for electron impact excitation of C II

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...432..731w&link_type=abstract

Astronomy and Astrophysics, Volume 432, Issue 2, March III 2005, pp.731-736

Astronomy and Astrophysics

Astrophysics

8

Atomic Processes, Line: Formation, Methods: Analytical

Scientific paper

We extend a previous calculation of effective collision strengths for electron impact excitation of the boron-like ion C II. The earlier work was restricted to the excitation within the 2s22p ground configuration and the sixteen 2s22p-2s2p2 fine-structure transitions whilst the present paper considers all fine-structure transitions among the levels arising from the lowest 16 LS states. The collisional cross sections are computed in the multichannel close-coupling R-matrix approximation, in which sophisticated configuration-interaction wave functions are used to represent the target states. The 16 states included have the following basis configurations: the 2s22p ground state, four 2s2p2 states, three 2p3 states, one 2s2p3s state as well as the 2s23l(l=s,p,d) and 2s24l(l=s,p,d,f) states. The 16 LS target states correspond to 30 fine-structure levels and lead to a total of 435 fine-structure transitions. In this paper we tabulate effective collision strengths, obtained by averaging the electron collision strengths over a Maxwellian distribution of velocities, for electron temperatures in the range given by log10 Te(K) = 3.0-5.5, suitable for most astrophysical applications and laboratory plasma diagnostics. Significant differences from a previous calculation are noted and comparisons are made with some recent experimental data.
Table 2 is 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/432/731

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