Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions

Convoy-electron emission produced by grazing-ion–surface scattering is studied in the framework of the distorted-wave theory. We develop a model, here named field distorted-wave (FDW) approximation, to describe the effect of the surface interaction on the electronic transition. In the model, the act...

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Autores principales: Gravielle, M.S., Miraglia, J.E.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10502947_v67_n4_p9_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_10502947_v67_n4_p9_Gravielle2023-10-03T15:59:29Z Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions Gravielle, M.S. Miraglia, J.E. Convoy-electron emission produced by grazing-ion–surface scattering is studied in the framework of the distorted-wave theory. We develop a model, here named field distorted-wave (FDW) approximation, to describe the effect of the surface interaction on the electronic transition. In the model, the action of the surface field on the ejected electron is seen as an additional momentum transfer that depends on the projectile position. We apply the FDW approximation to analyze electron distributions for 100 keV protons impinging on LiF(100) and Al(111) surfaces, which are insulator and metal materials, respectively. In the case of metals, the dynamic screening of the projectile is included in the Jost function corresponding to the final state. As experimentally observed, energy spectra of forward-ejected electrons display a prominent structure associated with the convoy-electron emission. We find that the maximum of the convoy-electron distribution is decelerated for LiF and accelerated for Al, with respect to its position in ion-atom collisions, in quantitative agreement with the experimental data. © 2003 The American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10502947_v67_n4_p9_Gravielle
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Convoy-electron emission produced by grazing-ion–surface scattering is studied in the framework of the distorted-wave theory. We develop a model, here named field distorted-wave (FDW) approximation, to describe the effect of the surface interaction on the electronic transition. In the model, the action of the surface field on the ejected electron is seen as an additional momentum transfer that depends on the projectile position. We apply the FDW approximation to analyze electron distributions for 100 keV protons impinging on LiF(100) and Al(111) surfaces, which are insulator and metal materials, respectively. In the case of metals, the dynamic screening of the projectile is included in the Jost function corresponding to the final state. As experimentally observed, energy spectra of forward-ejected electrons display a prominent structure associated with the convoy-electron emission. We find that the maximum of the convoy-electron distribution is decelerated for LiF and accelerated for Al, with respect to its position in ion-atom collisions, in quantitative agreement with the experimental data. © 2003 The American Physical Society.
format JOUR
author Gravielle, M.S.
Miraglia, J.E.
spellingShingle Gravielle, M.S.
Miraglia, J.E.
Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions
author_facet Gravielle, M.S.
Miraglia, J.E.
author_sort Gravielle, M.S.
title Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions
title_short Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions
title_full Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions
title_fullStr Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions
title_full_unstemmed Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions
title_sort acceleration and deceleration of convoy electrons in grazing-ion–surface collisions
url http://hdl.handle.net/20.500.12110/paper_10502947_v67_n4_p9_Gravielle
work_keys_str_mv AT graviellems accelerationanddecelerationofconvoyelectronsingrazingionsurfacecollisions
AT miragliaje accelerationanddecelerationofconvoyelectronsingrazingionsurfacecollisions
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