Abstract
Excitation cross sections by electron impact of tungsten ions, W39+, have been calculated using R-matrix method for a configuration state list consists of [Ar]3d104s24p5, [Ar]3d104s24p44l, (l = d, f), and [Ar]3d104s24p45l′, l′ = s, p. A set of configuration state functions (CSFs) with 2-electron excitations up to 5l orbitals have been included within the MCDF-calculations of the used radial integrals of collisional excitations. R-matrix calculations of collision strength and cross section have been executed for the intercombination transitions between 4p5, 4p44d, and 4p44f at different angular momenta using DARC code. Resonance cross section have been observed at low energy of incident electron in the range of ∼5=-40 Ryd, however, the strong lines limited between 5 and 25 Ryd. The relativistic distorted-wave (DW) approximation, Coulomb–Born-Exchange (CBE) approximation, and the Binary-Encounter-Dipole (BED) theory have been used to calculate the electron impact ionization (EII) of the present ion. The accuracies of the present results are estimated by comparing R-matrix calculations with the available literature.
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