Distorted Wave Method Applied to Electron Impact Excitation of the Lowest Autoionizing State of Rubidium

Oketch, Fredrick Omboga (2013) Distorted Wave Method Applied to Electron Impact Excitation of the Lowest Autoionizing State of Rubidium. Masters thesis, Kenyatta University.

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Abstract

The study of electron-atom collisions has several useful applications in high density gas discharges, laboratory and astrophysical plasmas and gas lasers. Knowledge of electron scattering from atoms and molecules is also important for the development of theoretical models for quantitative analysis of Auger-electron spectroscopy, X-ray photoelectron spectroscopy, electron microprobe analysis and analytical electron microscopy. In this study, integral cross-section, differential cross-sections, alignment and lambda parameters for electron impact excitation of first autoionizing state of Rubidium have been calculated using distorted-wave method. A linear combination of static potentials of initial and final target states has been applied as the final channel distortion potential and the static potential of the initial target state used as the initial channel distortion potential. The wave functions used in this model are the multi-zeta and the double-zeta Hartree-Fock single electron wave functions due to Clementi and Roetti. Numerical calculations were performed using a DWBA1 program, which was modified- to evaluate the exchange amplitudes exactly without any approximation. The present results have been compared with other known theoretical and experimental results. From the present calculations it is observed that at impact energy near threshold there is an abrupt increase in the integral cross sections and in the present alignment parameter results, a near threshold resonant structure was observed.

Item Type:	Thesis (Masters)
Subjects:	Q Science > QC Physics
Divisions:	Africana
Depositing User:	Tim Khabala
Date Deposited:	13 Sep 2017 06:14
Last Modified:	13 Sep 2017 06:14
URI:	http://thesisbank.jhia.ac.ke/id/eprint/2054

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