Theoretical Investigations Of (e,2e) Ionization Of Electron Impact Magnesium

In this thesis, the (e,2e) ionization process of electron impacting Mg (3s2) atoms in coplanar symmetric geometry is studied. The thesis is based on the approximation theory proposed by Brauner, Briggs and Klar (BBK model). Firstly, the BBK model is extended to Mg atoms which are multiple electron atoms for the first time. The process which electron impacts multiple electron atoms is reduced to three-body interaction problem, the triple differential cross sections (TDCS) are calculated in coplanar symmetric geometry. The optimized central effective potential and wave functions in scattering process are given in a parameterized form with the OEP method.In addition, due to low incident energy, we also consider dynamic screening effect from the theory proposed by Brauner and Briggs—the DS3C model. Using the DS3C model, the TDCS of Mg atoms are calculated by incident electron from threshold to beyond intermediate energies in coplanar symmetric geometry. The experimental data from Murray et al and other theoretical results are compared to our calculated results. The results show that:in low incident energy, Our calculated results with BBK model are unsuccessful while the results of the DS3C model agree well with the experimental data. But the BBK results are consistent to the experimental data with the increasing of incident energy. Our DS3C calculated results are better than the DWBA theory calculations in a certain extent. As the incident energy increased, the calculations of BBK theory and DS3C theory are closer to the experimental data. Our calculations theory can describe the (e,2e) ionization process of electron impact atoms well. If we consider the initial state correlation, the exchange effect of electrons and the post-collision interaction, the BBK theory and DS3C theory also can be extended to other more complex atomic collision process.