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Non-relativistic energies of $1s^22s$ and $1s^2np$ $(\leq 9)$ states for $Cu^{26+}$ ion are calculated by using the full-core plus correlation method. For $1s^22s$ and $1s^22p$ states, relative discrepancies between our results and high precision results of Yan et al. are within 0.1 ppm. By taking account of the first-order corrections to the energy from relativistic and mass-polarization effects, the higher-order relativistic contribution and QED correction to the energy are estimated under a hydrogen-like approximation. The transition energies, wavelengths and oscillator strengths for the $1s^22s-1s^2np$ transitions of the ion are calculated. The results obtained by the three forms are in good agreement with each other.
}, issn = {2079-7346}, doi = {https://doi.org/10.4208/jams.091009.101809a}, url = {http://global-sci.org/intro/article_detail/jams/8066.html} }Non-relativistic energies of $1s^22s$ and $1s^2np$ $(\leq 9)$ states for $Cu^{26+}$ ion are calculated by using the full-core plus correlation method. For $1s^22s$ and $1s^22p$ states, relative discrepancies between our results and high precision results of Yan et al. are within 0.1 ppm. By taking account of the first-order corrections to the energy from relativistic and mass-polarization effects, the higher-order relativistic contribution and QED correction to the energy are estimated under a hydrogen-like approximation. The transition energies, wavelengths and oscillator strengths for the $1s^22s-1s^2np$ transitions of the ion are calculated. The results obtained by the three forms are in good agreement with each other.