Electron-impact excitation of Fe-peak ions for astrophysical applications

Details Electron-impact excitation of Fe-peak ions for astrophysical applications Electron-impact excitation of Fe-peak ions for astrophysical applications

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jphcs.194a2019c&link_type=abstract

Journal of Physics: Conference Series, Volume 194, Issue 1, pp. 012019 (2009).

Physics

Scientific paper

This paper discusses one of the major outstanding problems in atomic collision physics, namely the accurate theoretical treatment of electron scattering from open d-shell systems, and explores how this issue has been addressed over recent years with the development of the new parallel R-matrix suite of codes. It focuses on one code in particular - the new parallel R-matrix package PRMAT, which has recently been extended to account for relativistic fine-structure effects. This program facilitates the determination of accurate electron-impact excitation rates for complex open 3d-shell systems including the astrophysically important Fe-peak ions such as Ni II, Fe II and Fe III. Results are presented for collision strengths and Maxwellian averaged effective collision strengths for the optically forbidden fine-structure transitions of Ni II. To our knowledge this is the most extensive calculation completed to date for this ion.

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