碱金属原子光电离过程研究和计算

Most research of photoionization with excitation focus on close-shell atoms, while the study of excitation process nearly limits to rare-gas(He, Ne and Ar). It is hard to find the study of open-shell atom within the frame of many-body perturbation theory. In this project, application of many-body perturbation theory to photoionization have been extended to treat photoionization with excitation(PIE) and double photoionization for open-shell atoms(Na, Mn and Ca+). We get the cross section of different process of photoionization, the resonancestructure of Ca including the interaction between photoionization and Auger contribution diagrams, which is observed xperimentally, but not previously calculated. To neutral Mn, We analyze the higher order diagrams in detail, and find that the second-order random-phase approximation(RPA) canreplace the Coulomb interaction of the first-order final state correlation(FSC).Continuously, we get the important results that RPA will influence the shape and the energy position of resonance structure.Thistheoretical study and calculations may guide the experiment to some extent.

研究碱金属原子的光电离、光电离激发和双电离过程，发展原子的多体微扰理论到开壳层原子。改进耦合方程方法，包括不同的光电离、光激发过程之间的相互作用，计算各种光电离过程的散射截面和共振结构，通过理论研究，掌握各种光电离过程的微观机理并与实验结果比较，为实验提供更进一步的理论指导。