Theoretical study on radiative cascade of Ne-like Fe²⁴⁺ ion in electron impact excitation

The electron impact excitation (EIE) collision strengths of He-like Fe²⁴⁺ ions form the ground state 1s²¹S₀ to all of excited states 1s2s and 1s2p are calculated systematically by using the fully relativistic distorted-wave program REIE06. Based on those calculations, the influence of the radiative cascade effects on the values of the x/w, y/w and z/w [w: 1s²¹S₀→1s2p ¹P₁, x: 1s²¹S₀→1s2p ³P₂, y: 1s²¹S₀→1s2p ³P₁, z: 1s²¹S₀→1s2s ³S₁] line-intensity ratio are discussed systematically at two electron energies: 6.68 Kev and 9.94 KeV. Some important conclusions are summarized. Also, comparisons of the present calculations with the available other calculations and experimental results are made. (authors)