Theoretical Calculation On The Energy Structures And Oscillator Strengths For1s²ns-1s²np States Of Se³¹ Ion

The present situation and the development about Atomic Physics in recent years are paidattention to in the article. The characteristics properties and the applications of the highlycharged ions are also described. The Se³¹⁺ion,one of the highly charged ions, is focused inthe paper. Dipole transitions between the states for1s²ns-1s²np （2≤n≤9） and oscillatorstrengths are also studied here.The method of Full Core Plus Correlation （FCPC） has been used mainly in the processof energy calculation. The non-relativistic energies for Se³¹⁺ions are obtained with thismethod. On this basis,the energies have been revised further successfully with the relativisticeffects、mass-polarization effects、QED effects and the higher-order relativistic effects. Sothe total energies, the ionization potentials,transition energies,transition wavelengthes and finestructures are calculated.According to the theory of quantum defect, the quantum defects forthe Se³¹⁺ions can be obtained. As a result, with the increasing of n, the quantum defectsincreases also.With this conclusion, the energies of higher excited states（n≥10）can bepredicted.The dipole oscillator strength for the1s²ns-1s²np（2≤n≤9） transitions can be caldulatedwith the total energies and the wave functions of FCPC. Combined calculation rueults of thedipole oscillator strength and the theory of single-channel quantum defect,the oscillatorstrength from initial state1s²2s to higher excited states（n≥10）to continous states can beobtained.