The branching ratios between the single and double electron radiative transitions to empty K shell in He-like ions with 2s2p configuration are evaluated for 15 ions with 4 Z 26 using fully relativistic multiconfiguration Dirac-Fock wavefunctions in the active space approximation. The effects of configuration interaction and Breit contributions on the transition parameters have been analyzed in detail. Though the influence of Breit interaction on the electric dipole allowed one-electron radiative transitions is negligible, it substantially changes the spinforbidden rates and the two-electron one-photon transition probabilities. Also, while the single electron transition rates are gauge independent, the correlated double-electron probabilities are found to be gauge sensitive. The probable uncertainties in the computed transition rates have been evaluated by considering the line strengths and the differences between the calculated and experimental transition energies as accuracy indicators. The present results are compared with other available experimental and theoretical data.
Multiconfiguration Dirac-Fock and relativistic configuration
interaction calculations with the inclusion of Breit
interaction, quantum electrodynamics and finite nuclear mass
corrections have been carried out in the extended optimal level
scheme on the spin-forbidden electric dipole transitions
of highly ionized argon. The calculations have been carried out
in jj coupling with a single electron in the K shell, varying
degrees of ionization in the L shell and open outer shells. The
radiative transition rates have been calculated in Coulomb and
length gauges. The sensitivity of the orbital wavefunctions and
the effect of configuration interaction on the transition rates
are analysed in some detail.
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