Theoretical Research On Excitation State Of Level Structure And Oscillator Strength For Ni²⁵⁺ Ion

In this article,the property and use of Ni element will be simply introduced,and then the produce and application for Highly Charged Ions will be illustrated.Energy level and spectral property of Rydberg series of 1s²nd (3≤n≤9)and 1s²nf4≤n≤9) of Ni²⁵⁺ ion are researched by using the FCPC,including transition energy,ionization energy potential,wavelength,fine structure, quantum defect, dipole oscillator strengths and so on. For Energy,Non-relativistic part are determined by extreme value of the eigenvalue of non-relativistic Hamiltonian operators, relativistic and mass-polarization effects on the energies are included as the first-order perturbation;In order to make the results more precise.In order to make the results more precise,quantum-electrodynamics(QED) contribution and higher-order relativistic contribution are considered for highly charged of ions.The correction of core and the higher angular momentum contributions are also calculated too. It shows that the results fit the experimental data well.The fine structure splitting are determined by the expectation value of spin-orbit and spin-other orbit interaction operators. Comparing the results with experimental data ,we can find that the error is too small and much less than experimental error.Meanwhile,The quantum defects of Rydberg series of 1s²nd (3≤n≤9)and 1s²nf4≤n≤9)are determined according to the single channel quantum defect theory.The results are as the same as what we expected,with principal quantum number increase,the quantum defect is going to be smaller and smaller.In this article,wave functions which is depended on FCPC is used to calculate oscillator strengths,the result obtained form three formula agree closely with each other,it shows that the wave functions which we selected is well.At last, the energies of any highly excited states with n≥10 also can be reliably predicted by combining the quantum defect theory with semi-empirical method.