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Title: Atom optics and surface growth studies using helium atom scattering
Author: Holst, B.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 1997
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The first part of thesis investigates the application of electrostatically deformed single crystal membranes as focusing elements for a neutral atomic beam in an ultra high resolution diffractometer. The second part demonstrates the versatility of helium as a surface science tool in a study of the growth of ultra thin Cu-films on Pt(111). Chapter 1 gives an introduction to the subject of atom focusing with an overview of the various methods hitherto applied. Chapter 2 presents a theoretical framework for the application of a focusing element in an ultra high resolution diffractometer. An off axis reflected ray equation is derived from which aberration coefficients are obtained and used to determine the best obtainable performance. Chapter 3 presents equations for calculating deformation of radically symmetric thin plates (membranes). Furthermore interferometry experiments are presented which investigate the deformation of single crystal Au(100) and Si(100) in varying fields. The films mechanical properties are discussed, and contourmaps obtained from the interferometry experiments used in computer simulations to evaluate their focusing properties. Chapter 4 contains the experimental methods and sample preparation of the two types of samples used here. The Pt(111) and the Si(111)-H(1 x 1) eventually chosen for the mirror. In particular a new mount specially designed for the focusing mirror is described in detail.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available