Date of Award

Summer 2008

Document Type


Degree Name

Doctor of Philosophy (PhD)



Committee Director

Colm T. Whelan

Committee Member

John A. Adam

Committee Member

Alexander L. Godunov

Committee Member

Mark D. Havey

Committee Member

J. Wallace Van Orden


In this thesis I investigate (e, 2e) processes, or electron impact ionization, using several theoretical methods. I first examine the problem using the Born approximations, particularly the Distorted Wave Born Approximation (DWBA), focusing on the underlying processes that dominate for ionization of the 2p state of Argon and Magnesium. I investigate as well the ionization of helium and hydrogen and use the simplicity of the approximation to probe the incident particle effects on the Helium cross section. In both cases the results are compared with experiment. I also produce cross section results for ions near threshold, a regime that is currently under experimental investigation. In the second part of this thesis, I develop an ab initio method for doing these calculations called the X2e method. This is described in full, including derivation of the important features of the method. Preliminary results are presented in comparison with established theory.


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