Description
The effective collision strengths for electron-impact excitation of fine-structure transitions in Si VII are calculated as a function of electron temperature in the range 5000-2000000 K. The B-spline Breit-Pauli R-matrix method has been used to calculate collision strengths by electron impact. The target wave functions have been obtained using the multi-configuration Hartree-Fock method with term-dependent non-orthogonal orbitals. The 92 fine-structure levels belonging to the 46 LS states of 2s^2^2p^4^, 2s2p^5^, 2p^6^, 2s^2^2p^3^3s, 2s^2^2p^3^3p, 2s^2^2p^3^3d, and 2s2p^4^3s configurations are included in our calculations of oscillator strengths and collision strengths. There are 4186 possible fine-structure allowed and forbidden transitions among the 92 levels. The present excitation energies, oscillator strengths, and collision strengths have been compared with previous theoretical results and available experimental data. Generally, a good agreement is found with the 6 LS-state close-coupling approximation results of Butler & Zeippen (1994, J/A+AS/108/1) and the 44 LS-state distorted wave calculation of Bhatia & Landi (2003ApJ...585..587B).
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