Grazing ion-surface collisions

Electron emission after grazing ion-surface collisions is studied for high impact velocities. We have focused on glancing angles of electron emission where the dominant mechanism is the ionization from atomic bound states. To describe this process, we introduce a quantum model called field distorted...

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Autor principal: Gravielle, M.S.
Formato: JOUR
Materias:
Angular distribution
Approximation theory
Electron emission
Ground state
Ionization
Quantum theory
Atomic bound states
Glancing angles
Impact velocities
Ion-surface collisions
Molecular interactions
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02811847_vT110_n_p398_Gravielle
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_02811847_vT110_n_p398_Gravielle2023-10-03T15:17:10Z Grazing ion-surface collisions Gravielle, M.S. Angular distribution Approximation theory Electron emission Ground state Ionization Quantum theory Atomic bound states Glancing angles Impact velocities Ion-surface collisions Molecular interactions Electron emission after grazing ion-surface collisions is studied for high impact velocities. We have focused on glancing angles of electron emission where the dominant mechanism is the ionization from atomic bound states. To describe this process, we introduce a quantum model called field distorted-wave (FDW) approximation, which takes into account the effect of the surface interaction on the electronic transition. The FDW model is applied to analyze electron distributions produced by impact of protons on Al and LiF surfaces, which are metal and insulator materials respectively. In the case of metals, we also evaluate the contibution coming from the valence band by employing the binary collisional formalism. Calculated electron emission yields are in reasonable agreement with the available experimental data. We find that the maximum of the convoy electron distribution is accelerated for Al and decelerated for LiF, with respect to its position in ion-atom collisions, in quantitative accordance with experiments. © Physica Scripta 2004. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02811847_vT110_n_p398_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 Angular distribution
Approximation theory
Electron emission
Ground state
Ionization
Quantum theory
Atomic bound states
Glancing angles
Impact velocities
Ion-surface collisions
Molecular interactions
spellingShingle Angular distribution
Approximation theory
Electron emission
Ground state
Ionization
Quantum theory
Atomic bound states
Glancing angles
Impact velocities
Ion-surface collisions
Molecular interactions
Gravielle, M.S.
Grazing ion-surface collisions
topic_facet Angular distribution
Approximation theory
Electron emission
Ground state
Ionization
Quantum theory
Atomic bound states
Glancing angles
Impact velocities
Ion-surface collisions
Molecular interactions
description Electron emission after grazing ion-surface collisions is studied for high impact velocities. We have focused on glancing angles of electron emission where the dominant mechanism is the ionization from atomic bound states. To describe this process, we introduce a quantum model called field distorted-wave (FDW) approximation, which takes into account the effect of the surface interaction on the electronic transition. The FDW model is applied to analyze electron distributions produced by impact of protons on Al and LiF surfaces, which are metal and insulator materials respectively. In the case of metals, we also evaluate the contibution coming from the valence band by employing the binary collisional formalism. Calculated electron emission yields are in reasonable agreement with the available experimental data. We find that the maximum of the convoy electron distribution is accelerated for Al and decelerated for LiF, with respect to its position in ion-atom collisions, in quantitative accordance with experiments. © Physica Scripta 2004.
format JOUR
author Gravielle, M.S.
author_facet Gravielle, M.S.
author_sort Gravielle, M.S.
title Grazing ion-surface collisions
title_short Grazing ion-surface collisions
title_full Grazing ion-surface collisions
title_fullStr Grazing ion-surface collisions
title_full_unstemmed Grazing ion-surface collisions
title_sort grazing ion-surface collisions
url http://hdl.handle.net/20.500.12110/paper_02811847_vT110_n_p398_Gravielle
work_keys_str_mv AT graviellems grazingionsurfacecollisions
_version_ 1807322760453554176

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