Relativistic theory of low energy electron diffraction

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dc.contributor.advisorSchaffer, Alfreden_ZA
dc.contributor.advisorFrahn, W Een_ZA
dc.contributor.authorFeder, Rolanden_ZA
dc.date.accessioned2016-03-14T07:25:52Z
dc.date.available2016-03-14T07:25:52Z
dc.date.issued1973en_ZA
dc.description.abstractIn view of investigating the role of spin polarization and further relativistic effects in the diffraction of low energy electrons (LEED) by crystals composed of heavy atoms, a relativistic dynamical theory is developed for calculating LEED intensities and spin polarizations. The presentation of the general framework of solving the boundary value problem for the mixed-representation Dirac equation is followed by the construction of a relativistic KKRZ-type electron-ion-core pseudopotential. The solution of the Dirac equation inside a model crystal that consists of this potential plus a bulk and surf ace optical potential is then derived in an algebraic form. Provision is made for taking into account thermal lattice effects. The computational application of this relativistic LEED theory to the (ool) and the (llo) surface pf tungsten firstly yields intensity results that are found to be in good agreement with experimental data. Secondly, appreciable spin polarization features are predicted, in particular in the specular beam for large angles of incidence on W(ool) at very low energies. It is concluded that measurement of spin polarization in LEED can be expected to be a valuable tool for obtaining additional information about the surface region.en_ZA
dc.identifier.apacitationFeder, R. (1973). <i>Relativistic theory of low energy electron diffraction</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Physics. Retrieved from http://hdl.handle.net/11427/17737en_ZA
dc.identifier.chicagocitationFeder, Roland. <i>"Relativistic theory of low energy electron diffraction."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Physics, 1973. http://hdl.handle.net/11427/17737en_ZA
dc.identifier.citationFeder, R. 1973. Relativistic theory of low energy electron diffraction. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Feder, Roland AB - In view of investigating the role of spin polarization and further relativistic effects in the diffraction of low energy electrons (LEED) by crystals composed of heavy atoms, a relativistic dynamical theory is developed for calculating LEED intensities and spin polarizations. The presentation of the general framework of solving the boundary value problem for the mixed-representation Dirac equation is followed by the construction of a relativistic KKRZ-type electron-ion-core pseudopotential. The solution of the Dirac equation inside a model crystal that consists of this potential plus a bulk and surf ace optical potential is then derived in an algebraic form. Provision is made for taking into account thermal lattice effects. The computational application of this relativistic LEED theory to the (ool) and the (llo) surface pf tungsten firstly yields intensity results that are found to be in good agreement with experimental data. Secondly, appreciable spin polarization features are predicted, in particular in the specular beam for large angles of incidence on W(ool) at very low energies. It is concluded that measurement of spin polarization in LEED can be expected to be a valuable tool for obtaining additional information about the surface region. DA - 1973 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1973 T1 - Relativistic theory of low energy electron diffraction TI - Relativistic theory of low energy electron diffraction UR - http://hdl.handle.net/11427/17737 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17737
dc.identifier.vancouvercitationFeder R. Relativistic theory of low energy electron diffraction. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Physics, 1973 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17737en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Physicsen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherPhysicsen_ZA
dc.titleRelativistic theory of low energy electron diffractionen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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