Theses/Dissertations - Physics
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Browsing Theses/Dissertations - Physics by Author "Ariyasinghe, Wickramasinghe M."
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Item Total electron scattering cross sections of molecules containing H, B, C, N, O, F, Si, P, S, and Cl in the energy range 0.1- 6.0 keV.(2017-11-06) Gurung, Meera Devi, 1978-; Ariyasinghe, Wickramasinghe M.The effective atomic total electron scattering cross sections (EATCS) of atomic H, B, C, N, O, F, Si, P, S, and Cl are proposed for 0.1-6.0 keV energies using the existing experimental total electron scattering cross sections (TCS) of simple molecules consisting of these atoms. Based on the EATCS , a simple empirical model depending on the symmetry and geometry of molecule is developed to predict the TCS of H, B, C, N, O, F, Si, P, S, and Cl containing molecules in the energy range 0.1-6.0 keV. The TCS of important biomolecules 2-Butanone Formamide, Trimethylamine, Aniline, Pyrimidine, Anthracene, five nucleic bases (adenine, cytosine, guanine, thymine and uracil) , Phosphoric acid, sugar substitute (Tetrahydrofuran, Furan, Tetrahydropyran, 3-hydroxytetrahydrofuran, D-Glucose, and alpha-D-glucose), and simple amino acids (Glycine, Lysine and L-histidine) in the energy range 0.1-6.0 keV are predicted using the model. The reliability of these predictions are verified by comparing the determined TCS with the available experimental and theoretical cross sections.Item Total electron scattering cross sections of Tetrafluoromethane, Trifluoromethane, Hexafluoroethane, and Octafluorocyclobutane in the energy range 0.10 to 4.50 keV.(2009-04-01T16:48:49Z) Palihawadana, Prasanga D.; Ariyasinghe, Wickramasinghe M.; Physics.; Baylor University. Dept. of Physics.The total electron scattering cross sections of Tetrafluoromethane, Trifluoromethane, Hexafluoroethane, and Octafluorocyclobutane are measured in the energy range 0.10 to 4.50 keV using the linear transmission technique. The measured experimental cross sections are compared with other experimental and theoretical cross sections available in the literature. A simple empirical formula is also developed by using the present measurements to predict the cross sections of linear fluorocarbons as a function of the electron energy and the number of atoms in the target molecule. This empirical formula is used to calculate the total cross sections of linear fluorocarbons in the energy range 0.30 to 3.50 keV. Those empirically calculated cross sections are compared to the present experimental cross sections and other experimental and theoretical cross sections available in the literature.