Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...506..464g&link_type=abstract
The Astrophysical Journal, Volume 506, Issue 1, pp. 464-471.
Astronomy and Astrophysics
Astronomy
18
Atomic Data, Plasmas
Scientific paper
Electron collisional excitation strengths for transitions among the fine-structure levels of the ground 3s^23p^2 configuration and from the levels of 3s^23p^2 configuration to the levels of the excited 3s3p^3 and 3s^23p3d configurations in Fe XIII are calculated using a semirelativistic R-matrix approach. We considered 14 LS 3s^23p^2^3P, ^1D, ^1S, 3s3p^3^3D^o, ^3P^o, ^1D^o, ^3S^o, ^1P^o, 3s^23p3d^3P^o, ^1D^o, ^3D^o, ^3F^o, ^1F^o, and ^1P^o states of Fe XIII in the present calculation. The 14 LS states give rise to 26 fine-structure levels that are represented by configuration-interaction wave functions. The relativistic effects are included in the Breit-Pauli approximation via one-body mass correction, Darwin, and spin-orbit interaction terms in the scattering equations. Complicated resonance structures are explicitly included in the collision strengths. The collision strengths are integrated over a Maxwellian distribution of electron energies to give effective collision strengths over a wide temperature range from 5 x 10^5 to 5 x 10^6 K.
Gupta G. P.
Tayal Swaraj S.
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