Theoretical Calculation Of The Energy Level Structure Of 1s²nl?l=0,1,2,3?States For Sr³⁵⁺ Ion

This paper,the energy level structure of 1s²nl?l=0,1,2,3,2?n?9?configuration for Sr³⁵⁺ion is studied by using multiple configuration interaction method,the relativistic energy,ionization potential,excitation energy and the transition energy of the 1s²nl?l=0,1,2,3?configuration are calculated.In calculation of relativistic energy,the relativistic effect and mass polarization effect are treated as a perturbation to calculate the correction for system energy,at the same time,the corrections from higher order relativistic theory and quantum electrodynamics are considered.In this paper,by calculating the expectation of the spin orbit interaction and the spin other orbit interaction,the splitting structure of 1s²nl?l=1,2,3?states is obtained.Compared with the existing experimental data,it found that most of the results are in good agreement.However,the calculated relativistic results of some excited states are not very good.The deviation is mainly due to the following two points:the calculation of the size of the atomic nucleus is ignored,and the correction of quantum electrodynamics is too simple.On the basis of the calculation,it should be noted the correction of the size of the nucleus and precise correction of the quantum electrodynamics need to be added in order to get more accurate results.This is the another new result of this paper.For the level structure of Sr³⁵⁺ion,the experimental and theoretical data are scarce.Therefore,according to the single channel quantum defect theory?QDT?,the ionization energy of 1s²nl?n?9?configuration for Sr³⁵⁺ion is extrapolated to highly excited states.The ionization energies we obtained by extrapolation and multiple configuration interaction method are in good consistence,it proved the rationality and validity of theoretical method that used in this paper.The new reference data for experimental research and theoretical exploration are provided.