Relativistic many-body calculations of electric-dipole lifetimes, rates and oscillator strengths of Delta n=0 transitions between 3l(-1)4l ' states in Ni-like ions

摘要

Transition rates, oscillator strengths and line strengths are calculated for electric-dipole (E1) transitions between odd- parity 3s(2)3p(6)3d(9)4l(1), 3s(2)3p(5)3d(10)4l(2) and 3s3p(6)3d(10)4l(1) states and even-parity 3s(2)3p(6)3d(9)4l(2), 3s(2)3p(5)3d(10)4l(1) and 3s3p(6)3d(10)4l(2) ( with 4l(1) = 4p, 4f and 4l(2) = 4s, 4d) in Ni-like ions with the nuclear charges ranging from Z = 34 to 100. Relativistic many- body perturbation theory (RMBPT), including the Breit interaction, is used to evaluate retarded E1 matrix elements in length and velocity forms. The calculations start from a 1s(2)2s(2)2p(6)3s(2)3p(6)3d(10) Dirac-Fock potential. First-order RMBPT is used to obtain intermediate coupling coefficients and second-order RMBPT is used to calculate transition matrix elements. Contributions from negative-energy states are included in the second-order E-1 matrix elements to ensure the gauge independence of transition amplitudes. Transition energies used in the calculation of oscillator strengths and transition rates are from second-order RMBPT. Lifetimes of the 3s(2)3p(6)3d(9)4d levels are given for Z = 34-100. These atomic data are important in modelling of M-shell radiation spectra of heavy ions generated in electron beam ion trap experiments and in M-shell diagnostics of plasmas.