Relativistic many-body calculations of excitation energies and transition rates from core-excited states in copperlike ions

摘要

Energies of (3s2 3p6 3d9 4l4l'), (3s2 3p5 3d10 4l4l'), and (3s 3p6 3d104l4l') states for Cu-like ions with Z = 30 -100 are evaluated to second orderin relativistic many-body perturbation theory (RMBPT) starting from a Ni-likeDirac-Fock potential. Second-order Coulomb and Breit-Coulomb interactions areincluded. Correction for the frequency-dependence of the Breit interaction istaken into account in lowest order. The Lamb shift correction to energies isalso included in lowest order. Intrinsic particle-particle-hole contributionsto energies are found to be 20-30% of the sum of one- and two-bodycontributions. Transition rates and line strengths are calculated for the3l-4l' electric-dipole (E1) transitions in Cu-like ions with nuclear charge Z =30 - 100. RMBPT including the Breit interaction is used to evaluate retarded E1matrix elements in length and velocity forms. First-order RMBPT is used toobtain intermediate coupling coefficients and second-order RMBPT is used tocalculate transition matrix elements. A detailed discussion of the variouscontributions to the dipole matrix elements and energy levels is given forcopperlike tungsten (Z = 74). The transition energies used in the calculationof oscillator strengths and transition rates are from second-order RMBPT.Trends of the transition rates as functions of $Z$ are illustrated graphicallyfor selected transitions. Comparisons are made with available experimentaldata. These atomic data are important in modeling of M-shell radiation spectraof heavy ions generated in electron beam ion trap experiments and in M-shelldiagnostics of plasmas.