Fast interaction of atoms with crystal surfaces: Coherent lighting

Quantum coherence of incident waves results essential for the observation of interference patterns in grazing incidence fast atom diffraction (FAD). In this work we investigate the influence of the impact energy and projectile mass on the transversal length of the surface area that is coherently ill...

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Autores principales: Gravielle, M.S., Bray A., Kheifets A., Machacek J., Hodgman S.
Formato: CONF
Materias:
Atomic beams
Lithium compounds
Quantum theory
Surface analysis
Collision systems
Crystallographic directions
Fast atom diffractions
Initial value representation
Interference effects
Interference mechanisms
Interference patterns
Interference structures
Atoms
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_17426588_v875_n2_p_Gravielle
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_17426588_v875_n2_p_Gravielle
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spelling todo:paper_17426588_v875_n2_p_Gravielle2023-10-03T16:31:14Z Fast interaction of atoms with crystal surfaces: Coherent lighting Gravielle, M.S. Bray A. Kheifets A. Machacek J. Hodgman S. Atomic beams Lithium compounds Quantum theory Surface analysis Collision systems Crystallographic directions Fast atom diffractions Initial value representation Interference effects Interference mechanisms Interference patterns Interference structures Atoms Quantum coherence of incident waves results essential for the observation of interference patterns in grazing incidence fast atom diffraction (FAD). In this work we investigate the influence of the impact energy and projectile mass on the transversal length of the surface area that is coherently illuminated by the atomic beam, after passing through a collimating aperture. Such a transversal coherence length controls the general features of the interference structures, being here derived by means of the Van Cittert-Zernike theorem. The coherence length is then used to build the initial coherent wave packet within the Surface Initial Value Representation (SIVR) approximation. The SIVR approach is applied to fast He and Ne atoms impinging grazingly on a LiF(001) surface along a low-indexed crystallographic direction. We found that with the same collimating setup, by varying the impact energy we would be able to control the interference mechanism that prevails in FAD patterns, switching between inter-cell and unit-cell interferences. These findings are relevant to use FAD spectra adequately as a surface analysis tool, as well as to choose the appropriate collimating scheme for the observation of interference effects in a given collision system. © Published under licence by IOP Publishing Ltd. CONF info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_17426588_v875_n2_p_Gravielle
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Atomic beams
Lithium compounds
Quantum theory
Surface analysis
Collision systems
Crystallographic directions
Fast atom diffractions
Initial value representation
Interference effects
Interference mechanisms
Interference patterns
Interference structures
Atoms
spellingShingle Atomic beams
Lithium compounds
Quantum theory
Surface analysis
Collision systems
Crystallographic directions
Fast atom diffractions
Initial value representation
Interference effects
Interference mechanisms
Interference patterns
Interference structures
Atoms
Gravielle, M.S.
Bray A.
Kheifets A.
Machacek J.
Hodgman S.
Fast interaction of atoms with crystal surfaces: Coherent lighting
topic_facet Atomic beams
Lithium compounds
Quantum theory
Surface analysis
Collision systems
Crystallographic directions
Fast atom diffractions
Initial value representation
Interference effects
Interference mechanisms
Interference patterns
Interference structures
Atoms
description Quantum coherence of incident waves results essential for the observation of interference patterns in grazing incidence fast atom diffraction (FAD). In this work we investigate the influence of the impact energy and projectile mass on the transversal length of the surface area that is coherently illuminated by the atomic beam, after passing through a collimating aperture. Such a transversal coherence length controls the general features of the interference structures, being here derived by means of the Van Cittert-Zernike theorem. The coherence length is then used to build the initial coherent wave packet within the Surface Initial Value Representation (SIVR) approximation. The SIVR approach is applied to fast He and Ne atoms impinging grazingly on a LiF(001) surface along a low-indexed crystallographic direction. We found that with the same collimating setup, by varying the impact energy we would be able to control the interference mechanism that prevails in FAD patterns, switching between inter-cell and unit-cell interferences. These findings are relevant to use FAD spectra adequately as a surface analysis tool, as well as to choose the appropriate collimating scheme for the observation of interference effects in a given collision system. © Published under licence by IOP Publishing Ltd.
format CONF
author Gravielle, M.S.
Bray A.
Kheifets A.
Machacek J.
Hodgman S.
author_facet Gravielle, M.S.
Bray A.
Kheifets A.
Machacek J.
Hodgman S.
author_sort Gravielle, M.S.
title Fast interaction of atoms with crystal surfaces: Coherent lighting
title_short Fast interaction of atoms with crystal surfaces: Coherent lighting
title_full Fast interaction of atoms with crystal surfaces: Coherent lighting
title_fullStr Fast interaction of atoms with crystal surfaces: Coherent lighting
title_full_unstemmed Fast interaction of atoms with crystal surfaces: Coherent lighting
title_sort fast interaction of atoms with crystal surfaces: coherent lighting
url http://hdl.handle.net/20.500.12110/paper_17426588_v875_n2_p_Gravielle
work_keys_str_mv AT graviellems fastinteractionofatomswithcrystalsurfacescoherentlighting
AT braya fastinteractionofatomswithcrystalsurfacescoherentlighting
AT kheifetsa fastinteractionofatomswithcrystalsurfacescoherentlighting
AT machacekj fastinteractionofatomswithcrystalsurfacescoherentlighting
AT hodgmans fastinteractionofatomswithcrystalsurfacescoherentlighting
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