Resonance States Of Helium-like Ion Systems In Quantum Plasmas

In recent years,with the development of laser-plasma technology in the laboratory,the research on atomic and molecular physics,plasmas physics,and astrophysics has gradually deepened,and the research on the structure of atomic,molecular,and ionic systems in plasmas has become a hot topic at present.In this thesis,the doubly excited ^1,3P^o resonance states of the helium-like ion systems in quantum plasmas are studied by using highly correlated exponential wave functions within the framework of the stabilization method.Because of the multi-particle interaction in quantum plasmas,the plasma density will increase,and the traditional Debye-Hückel model cannot simulate the quantum plasmas environment,so the modified Debye-Hückel potential(or exponential-cosine-screened Coulomb potential)is used to simulate dense quantum plasmas.In the process of calculation,the variational method is mainly applied,and the highly correlated exponential wave functions including quasi-random process is used to deal with the correlation problem between electrons,so as to obtain high-precision numerical solution.The doubly excited ^1,3P^o resonance states of helium-like ion systems(nuclear charge number Z=2-10)below the N=2 threshold under different screening parameters have been investigated in this thesis.The resonance parameters are the focus of our theoretical calculation,including resonance energies and resonance widths.We provide accurate data results of resonance energies at nine energy levels including 2snp₊(2?n?5),2snp_-(3?n?5),and 2pnd(3?n?4)three series.And the data results of resonance widths at five energy levels including 2snp₊(2?n?4)and 2snp_-(3?n?4)two series with the best fitting effect are selected.When the plasma screening parameter is zero,it is a free ion system under Coulomb potential,the theoretical calculation results of resonance parameters of helium-like ion system are in good agreement with the reported results.When the plasma screening parameter is not zero,it is helium-like ion systems in quantum plasmas environment,we list the accurate data results of theoretical calculation of the resonance parameters of the systems in this thesis.In the calculation,the convergence of ^1,3P^o resonance results has been checked by increasing the wave functions,and the whole numerical solution process has been completed with four precision of computer.In view of our interest in the experimental study of resonance states of helium-like ion systems,and the vigorous development of theoretical calculation of resonance of atomic and molecular systems under screening environments,we hope that our work can provide useful information for the research of related fields such as atomic and molecular physics,astrophysics and plasma physics.