Cross sections by electron impact excitation and ionization of tungsten ions, W³⁹⁺

Highlights: • The calculations of cross sections for highly charged tungsten is performed. • DARC code has been used to calculate the partial waves and radial integrals of wave functions. • The direct-ionization cross section has been calculated of W³⁹⁺. - 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.