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Aspects of atom beam microscopy and scattering from surfaces

Specifically, I describe the design and construction of the vibrational isolation system, and an ex-vacuo manipulator with micron-level accuracy used to position key atom-optical components.  Both aspects of the scattering helium microscope (SHeM) are shown to be successful in design and operation. In chapter 5 we introduce and develop a one and two-dimensional simulation of atom scattering from surfaces.  Novel aspects of the simulation include the ability to treat different scattering elements assembled in an arbitrary fashion. In chapter 6, we apply the novel one-dimensional simulation to homoepitaxy and ion erosion of the Pt(12 12 11) surface. Secondly, we examine the one-dimensional strain relief dislocation networks in the growth of lithium on the Cu(100) surface, between 0.5 and 0.6ML coverage. The observed diffraction patterns are shown to arise from a degree of disorder, which explains the broadening and shifting of the diffraction peaks. Chapter 7 contains a two-dimensional analysis of a dilute overlayer structure formed by low coverage of Li/Cu(100), and an incommensurate island structure for thin film growth greater than one monolayer. We also analyse a two-dimensional strain relief dislocation network formed five monolayer growth of Cu/Pt(12 12 11), finding a triangular dislocation network accounts for the diffraction spot profiles occurring.

Identiferoai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:596236
Date January 2007
CreatorsBacon, R. T.
PublisherUniversity of Cambridge
Source SetsEthos UK
Detected LanguageEnglish
TypeElectronic Thesis or Dissertation

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