The Calculations Of Ionization Potential Depression Of Ion In Dense Plasmas

With the development of X-ray free electron laser,the control of the plasma can reach a higher level in the laboratory,and the research on structures and process of the ions in the plasma have been further developed.Especially the experiment on ionization potential depression（IPD）of Al ions in the aluminum plasma were performed at LCLS,but the results of the experiment on K edges had a large disagreement with the results of using Stewart-Pyatt（SP）model,which’s used widely in the 60’s of the last century.It caused people’s great interest in the study of ion ionization in the plasma.In this paper,the structure of the ions in the plasma are studied.The energy level structure of the ion will be calculated,and the two transition spectra of the Kα line（1s²（¹S₀）-1s2p（³P₁）,1s²（¹S₀）-1s2p（¹P₁））of the He-like ions will be obtained.It is found that the shift of the transition energy has a large dependency with the plasma electron temperature and the free electron density.The ionization energy of the inner shell electron of the ion in different valence states can be analyzed and calculated.we find that the plasma screening effect would increase and the shift of the ionization energy also would become more lager with the increase of the ionization degree of ions.Lastly the comparision was maked with the experiment results and a good agreement was found.