Theoretical Study On Photoionization Processes Of Complex Atoms And Decay Processes Of Hollow Atoms With Holes In Inner Shell

Photoionization is a basic process in the atomic and molecular physics. The absolute photoionization cross sections of neutral atoms and ions are needed for the investigation of the plasma opacities and plasma diagnostics. Meanwhile, studying of the photoionization has great contribution to the astrophysics research and the understanding of the role of electron correlation. Otherwise, many hollow atoms with holes in innershell will be produced in the photoionization processes. By studing on its decay processes and final–charge-state distribution, we not only can obtain some information of electron structures in innershell, but also can get some dynamics rules of decay processes of relevant atoms and ions. Meanwhile, some relevant experiment results and ionic state population in evergy kinds of plasma processes can be interpreted very well.In this thesis, the development of atomic physics and quantum mechanics, the progress in photoionization research, the summarize of hollow atoms or ions and the research content as well as basis framework in this paper have been introduced in Chapter 1; The multiconfiguration Dirac-Fock (MCDF) method, the formula of photoionization cross section and the probabilities of Auger decay and so on have been given in Chapter 2; the Ne 1s photoionizaion spectrum has been simulated by using the recently developed REEE06 code, Furthermore, Auger decay processes of the final states, satellite states produced in the processes of Ne 1s photoionization and excited states Ne 1s-13p has been studied using XAUGER program in Chapter 3, we can conclude that spectator Auger decay processes are the main decay mechanism for hollow atoms or ions with spectator electron; In Chapter 4, the cascade decay and final-charge-state distribution of hollow Ar ions with two holes in L shell has been studied using the radiative-Auger cascade model (RAC), it is found that the initial vacancies are deeper, its decay processes are more complex and the population of higher charge states are higher than the lower charge states. At the same time, based on the final recoil vertical momentum vector measured in the process of 30KeV He2+ collisions with Ar on Recoil Ion Momentum Spectroscopy (RIMS) constructed in the institute of modern physics of lanzhou, Auger decay processes and final-charge-state distribution of every excited Ar ions aroused from the collision of low He2+ with Ar has been calculated; In Chapter 5, The energy level structures, resonance excitated energy and various radiative decay properties of ground state and excited states which are formed from exciting a 3d electron to 4l(l=s,p,d,f) and 5l(l=s,p,d,f) of Sc-like Au58+ and Mn-like Au54+ ions are studied by using MCDF method,concluded the correction of relativity effect,QED effect,Breit interaction and relaxation effect. It is discovered that the oscillator strengths in length gauge and velocity gauge are in accordance with each other, and with the increase of the nl, the difference between energies are smaller and the degenerate between energies are stronger; In Chapter 6, some summarization and a vista of future work have been given.