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Abstract:

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.

Registro:

Documento: Artículo
Título:Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions
Autor:Gravielle, M.S.; Miraglia, J.E.
Filiación:Instituto de Astronomía y Física del Espacio, Casilla de Correo 67, Sucursal 28, Buenos Aires, 1428, Argentina
Departamento de Física, Universidad Nacional de Buenos Aires, Buenos Aires, Argentina
Año:2003
Volumen:67
Número:4
Página de inicio:9
DOI: http://dx.doi.org/10.1103/PhysRevA.67.042901
Título revista:Physical Review A - Atomic, Molecular, and Optical Physics
Título revista abreviado:Phys Rev A
ISSN:10502947
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v67_n4_p9_Gravielle

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Citas:

---------- APA ----------
Gravielle, M.S. & Miraglia, J.E. (2003) . Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions. Physical Review A - Atomic, Molecular, and Optical Physics, 67(4), 9.
http://dx.doi.org/10.1103/PhysRevA.67.042901
---------- CHICAGO ----------
Gravielle, M.S., Miraglia, J.E. "Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions" . Physical Review A - Atomic, Molecular, and Optical Physics 67, no. 4 (2003) : 9.
http://dx.doi.org/10.1103/PhysRevA.67.042901
---------- MLA ----------
Gravielle, M.S., Miraglia, J.E. "Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions" . Physical Review A - Atomic, Molecular, and Optical Physics, vol. 67, no. 4, 2003, pp. 9.
http://dx.doi.org/10.1103/PhysRevA.67.042901
---------- VANCOUVER ----------
Gravielle, M.S., Miraglia, J.E. Acceleration and deceleration of convoy electrons in grazing-ion–surface collisions. Phys Rev A. 2003;67(4):9.
http://dx.doi.org/10.1103/PhysRevA.67.042901