Effective collision strengths for fine-structure forbidden transitions among the 3s^23p^3 levels of AR IV

Details Effective collision strengths for fine-structure forbidden transitions among the 3s^23p^3 levels of AR IV Effective collision strengths for fine-structure forbidden transitions among the 3s^23p^3 levels of AR IV

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.284..754r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 284, Issue 3, pp. 754-760.

Astronomy and Astrophysics

Astronomy

16

Atomic Processes, Line: Formation.

Scientific paper

The multichannel R-matrix method is used to compute electron impact excitation collision strengths in Ar iv for all fine-structure transitions among the ^4S^o, ^2D^o and ^2P^o levels in the 3s^23p^3 ground configuration. Included in the expansion of the total wavefunction are the lowest 13 LS target eigenstates of Ar iv formed from the 3s^23p^3, 3s3p^4 and 3s^23p^23d configurations. The effective collision strengths, obtained by averaging the electron collision strengths over a Maxwellian distribution of electron velocities, are presented for all 10 fine-structure transitions over a wide range of electron temperatures of astrophysical interest (T_e=2000-100 000K). Comparisons are made with an earlier 7-state close-coupling calculation by Zeippen, Butler & Le Bourlot, and significant differences are found to occur for many of the forbidden transitions considered, in particular those involving the ^4S^o ground state, where discrepancies of up to a factor of 3 are found in the low-temperature region.

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