Theoretical Research On The Excitation Energies And Oscillator Strength Of Excited States 1s²nd-1s²n'f For Cu²⁶⁺ Ion

In this paper,we continue theoretical study of highly charged lithium-like Cu²⁶⁺ion. It mainly discusses the total energy, the ionization potentials, excitation energies and transition energy of 1s²nl (l=d,f;n≤9)states for Cu²⁶⁺ion.The principle method is Full-core plus correlation (FCPC) adopted by Chung in 1991. In order to obtain the high-precision theoretical results ,the contributions from higher angular momentum partial wave and the core-correction are also involved. Relativistic and mass-polarization effects on the energies are included using the first-order perturbation theory, to calculate corrections to the total energy. The quantum-electrodynamics (QED)contribution to the ionization potentials and excitation energies are evaluated by using effective nuclear charges. At the same time, we take higher-order relativistic contribution into account. In the calculation of the fine structure splitting for these states, spin-orbit, spin-other-orbit interactions, the QED and higher-order relativistic contributions are all estimated. The results of this work generally agree with those of experiments. The quantum defects of 1s²nl (l=d,f;n≤9)two Rydberg series for Cu²⁶⁺ion are determined by the single-channel quantum defect theory. The energies of any highly excited states with n≥10 for this series can be reliably predicted using the quantum defects which are function of energy.In addition, The dipole oscillator strengths for the 1s²nd-1s²n′f (3≤n≤9,4≤n′≤9)transitions of Cu²⁶⁺ion are also calculated with FCPC wave functions obtained above. Finally, combining the single channel quantum defect theory with the discrete oscillator strengths, the ion energy and the oscillator strengths are accurately extrapolated to the entire energy region including the continuum states.