Theoretical study on 2s2p^6np Rydberg states of Cu^19＋ ion

We report on the calculations of transition wavelengths and weighted oscillator strengths for 2s 2 2p 6-2s2p 6 np （4≤n≤20） electric dipole （E1） transitions of Cu 19+ ion.The flexible atomic code （FAC） has been adopted for the calculations.Comparisons are made with the experimental data available,showing that the present results for 4 ≤n≤6 are more accurate than the previous calculated values.Furthermore,combining the quantum defect theory （QDT） with the transition energies of 2s22p～6-2s2p～6np,the quantum defects for 2s2p 6 np Rydberg series of Cu～（19+）ion are determined.In addition,the energies of any highly excited states （n>20） for this series can be reliably predicted using the QDT and the given quantum defects.The ionization energies for Cu¹⁹⁺ and Cu²⁰⁺ ions are also calculated and they excellently accord with previous experimental and calculated values.