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

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

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..dmp.m5030b&link_type=abstract

American Physical Society, DAMOP Meeting, May 16-19, 2001 London, Ontario, Canada Bulletin of the American Physical Society, Vol

Astronomy and Astrophysics

Astrophysics

Scientific paper

Electron temperatures and densities are difficult to determine in many astrophysical plasmas. However, it is well known that diagnostics on forbidden line intensity ratios for ions in the phosphorous isoelectronic sequence are of great importance in astrophysics, particularly for nebulae. A key element in the analysis is highly accurate atomic data. In this work we extend the earlier calculations of Butler, Zeippen and Le Bourlot (Astron. Astrophys. 203 189 (1988)) on electron scattering by K v. We have obtained effective collision strengths for a wide range of electron temperatures using the R-matrix method. Twenty-two LS target eigenstates are included in the expansion of the total wavefunction, consisting of the seven n=3 states with configuration 3s^23p^3 and 3s3p^4, twelve n=3 states with configuration 3s^23p^23d, and three n=4 states with configuration 3s^23p^24s. The fine-structure collision strengths have been obtained by transforming to a jj-coupling scheme using the JAJOM program of Saraph (Comp. Phys. Commun. 15 247 (1978)) and have been determined at a sufficiently fine energy mesh to delineate properly the resonance structure. Results for both collision strengths and for effective collision strengths will be presented at the conference and comparison will be made with the earlier work.

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