Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Atom scattering"”.
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Helium Atom Scattering from Chiral Structures
Helium Atom Scattering (HAS) is the only diffraction technique that combines absolute sur- face sensitivity with non-destructiveness and universality, but has been seldom applied to the study of chiral surfaces. The current thesis focuses on advancing the available theoretical and experimental tools …
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Ultralong range Rydberg molecules : investigation of a novel binding
… shown whose binding is based solely on electron-atom scattering. These molecules are composed of a Rydberg atom and a ground state atom - here Rb(ns) and Rb(5s) - where the binding arises from scattering of the Rydberg electron from the ground state atom. The ground state atom is bound to the …
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Ultracold Rydberg Atoms in Structured and Disordered Environments
The properties of a Rydberg atom immersed in an ultracold environment were investigated. Two scenarios were considered, one of which involves the neighbouring ground-state atoms arranged in a spatially structured configuration, while the other involves them distributed randomly in space. To …
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Ultrafast Dynamics and Interactions During Growth at Surfaces
Helium-3 spin-echo (3HeSE) is a helium atom scattering technique capable of studying nanoscopic surface dynamics in thermal equilibrium. The energy resolution, which greatly exceeds that of alternative methods, makes it possible to probe motion on picosecond to nanosecond timescales. The present …
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Fully differential study of dissociative capture in P + H₂ collisions
… properties has been studied in several ion-atom scattering processes. These studies strongly suggested that cross sections could be significantly affected by the projectile coherence properties, especially for fast, heavy ions. In the present study, we used such coherence effects as a tool …
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Design and development of a time of flight fast scattering spectrometer : a quantitative surface analysis technique and a new approach towards the experimental investigation of the surface particle interactions
… benefits compared to conventional Low Energy Ion Scattering Spectrometry (LEISS). A major potential advantage arising from the absence of charge exchange complications is the possibility of quantification. The instrumentation that has been developed also offers the possibility of unique studies …
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Self-assembly of amino acids on noble metal surfaces : morphological, chemical and electronic control of matter at the nanoscale
… microscopy (STM) and spectroscopy (STS), helium atom scattering (HAS), x-ray photoelectron spectroscopy (XPS) and near-edge x-ray absorption fine structure (NEXAFS) in ultrahigh vacuum (UHV). On Ag(111), methionine self-assembles into supramolecular chains following the <110> substrate axis, …
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Studying complex surface dynamical systems using helium-3 spin-echo spectroscopy
… pieces of equipment. MiniScat, a compact helium atom scattering apparatus, has been designed as a sample preparation facility to enable structural studies and increase the experimental throughput. A new supersonic helium beam source improves the resolution of the HeSE spectrometer by a factor of …
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The formation of contrast in scanning helium microscopy
… technique has emerged that uses neutral helium atoms as the probe particles. It has been termed scanning helium microscopy (SHeM), also known as neutral atom microscopy (NAM). SHeM produces helium atom micrographs by scanning the sample beneath a focused or collimated helium microprobe. As the …
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Instrumentation and contrast mechanisms in scanning helium microscopy
… that uses low energy (5-100 meV) helium atoms to image the surface of a sample. Since helium is inert and neutral, it can be used to study delicate and insulating surfaces, but that also means it can be difficult to manipulate for focussing and detection. The first reflection mode helium …