Effective Collision Strengths for Electron-impact Excitation of Fe VIII

Details Effective Collision Strengths for Electron-impact Excitation of Fe VIII Effective Collision Strengths for Electron-impact Excitation of Fe VIII

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...743..206t&link_type=abstract

The Astrophysical Journal, Volume 743, Issue 2, article id. 206 (2011).

Astronomy and Astrophysics

Astronomy

Atomic Data, Atomic Processes

Scientific paper

New extensive calculations are reported for electron collision strengths, rate coefficients, and transition probabilities for the astrophysically important lines of Fe VIII. The collision strengths have been calculated in the close-coupling approximation using the B-spline Breit-Pauli R-matrix method. The multiconfiguration Hartree-Fock method with term-dependent non-orthogonal orbitals is employed for an accurate representation of the target wave functions. The close-coupling expansion includes 102 fine-structure levels of Fe VIII covering all possible terms of the ground 3p 63d and singly excited 3p 53d 2, 3p 64l, 3p 53d4s, 3s3p 63d 2, and 3p 65l configurations. The present calculations are more extensive than the previous ones, leading to a total 5151 transitions between fine-structure levels. The effective collision strengths are obtained by averaging the electron collision strengths over a Maxwellian distribution of velocities and these are tabulated for all fine-structure transitions at electron temperatures in the range from 5 × 103 to 5 × 106 K. There is an overall good agreement with the previous 77-state calculations by Griffin, Pindzola, & Badnell, but significant differences are also noted for some transitions.

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