Effective Collision Strengths for Electron Impact Excitation of Fine-Structure Levels in Fe XI

Details Effective Collision Strengths for Electron Impact Excitation of Fine-Structure Levels in Fe XI Effective Collision Strengths for Electron Impact Excitation of Fine-Structure Levels in Fe XI

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...510.1078g&link_type=abstract

The Astrophysical Journal, Volume 510, Issue 2, pp. 1078-1081.

Astronomy and Astrophysics

Astronomy

16

Atomic Data, Atomic Processes

Scientific paper

Collision strengths for transitions between the 3s^23p^4 P_2,1,03, ^1D_2, and ^1S_0 levels and from these levels to the 3s3p^5 P^o_2,1,03 and ^1P^o_1 levels of Fe XI are calculated using a semirelativistic R-matrix approach. The 38 fine-structure levels arising from the 20 LS 3s^23p^4 P3, ^1D, ^1S, 3s3p^5 P^o3, ^1P^o, 3s^23p^3(^4S^o)3d D^o3, 3s^23p^3(^2P^o)3d P^o1,3, ^1,3D^o, ^1,3F^o, 3s^23p^3(^2D^o)3d S^o1,3, ^1,3P^o, ^1,3D^o, ^1,3F^o states are included in our calculation. These target levels are represented by configuration-interaction wave functions. The relativistic effects are considered in the Breit-Pauli approximation by including one-body mass correction, Darwin term, and spin-orbit terms in the scattering equations. Complicated resonance structures are found to enhance the collision strengths significantly for many transitions in the threshold energy regions. Our collision strengths are compared with the available results of Bhatia & Doschek at 8.0, 16.0, and 24.0 ryd. The collision strengths are integrated over a Maxwellian distribution of electron energies to give effective collision strengths over a wide temperature range.

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