Electron Impact Excitation of Fine-Structure Levels in Neon-Like Krypton (Kr XXVII) Using R-Matrix Method
Collision Strengths for transitions between the ground state and the lowest 26 fine-structure levels of Neon-like Krypton (Kr XXVII) are calculated using Breit-Pauli R-matrix method. The 27 fine-structure levels arising from the four lowest configurations 2s22p6, 2s22p53s, 2s22p53p, and 2s22p53d are included. Terms of the Breit-Pauli Hamiltonian are explicitly included in determining both the target and the scattering wavefunctions. All target levels included in the calculation are represented by configuration interaction wave functions. Our collision strengths are compared with the relativistic distorted-wave results of Reed. The excitation cross sections are integrated over a Maxwellian distribution of electron energies to give electron excitation rate coefficients which are tabulated over a wide range of temperatures from 600 eV to 2200 eV. The relative level populations for different electron densities and temperatures are also presented.