Electron impact excitation of Kr XXVIII

Collision strengths (Ω  ) are calculated for all 6328 transitions among the lowest 113 levels belonging to the 2s22p5,2s2p6,2s22p43ℓ,2s2p53ℓ2s22p5,2s2p6,2s22p43ℓ,2s2p53ℓ, and 2p63ℓ2p63ℓ configurations of fluorine-like krypton, Kr XXVIII, using the Dirac Atomic R  -matrix Code. All partial waves with angular momentum J⩽40J⩽40 are included, sufficient for the convergence of Ω for forbidden transitions. For allowed transitions a top-up is employed to obtain converged values of Ω up to an energy of 400 Ryd. Resonances in the thresholds region are resolved on a narrow energy mesh, and results for effective collision strengths (ϒ) are obtained after averaging the values of Ω over a Maxwellian distribution of electron velocities. Values of ϒ   are reported over a wide temperature range below 107.1K, and the accuracy of the results is assessed. In addition, effective collision strengths are listed for the temperature range 7.0⩽logTe(K)⩽9.0, obtained from non-resonant collision strengths generated with the FAC code.