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Artículo

Discrepancy between theory and experiment in double ionization of helium by fast electrons

Ambrosio, Marcelo JoséIcon ; Colavecchia, Flavio DarioIcon ; Mitnik, Dario MarceloIcon ; Gasaneo, GustavoIcon
Fecha de publicación: 01/2015
Editorial: American Physical Society
Revista: Physical Review A: Atomic, Molecular And Optical Physics
ISSN: 1050-2947
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Física Atómica, Molecular y Química

Resumen

We compute fully differential cross sections for double ionization of helium by electrons, within the high-impact-energy and low-momentum transfer regimes, using the generalized Sturmian functions approach. Our results are converged relative to the total angular momentum and variable domain size. The method shows very good agreement with convergent close coupling calculations performed by Kheifets et al. [J. Phys. B 32, 5047 (1999), 10.1088/0953-4075/32/21/301] for all ejection angles for the two electron emission energies considered in the experiments reported in that contribution. Both theoretical methods provide fully differential cross sections that require the same upscaling factors to compare with experimental data and are based on a first-order Born model for the projectile-target interaction. Since that reference was published, there were several theoretical efforts to account for the absolute scale of the experimental results, but agreement in the cross-section magnitude was not achieved even between theories. With the present contribution we conclude that the first-order Born model is now adequately solved, shifting the magnitude controversy towards either the experimental data and/or the addition of higher degrees of projectile-target interaction to the calculation.
Palabras clave: Double Ionization , Helium , Discrepancy , Theory
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/16698
URL: http://journals.aps.org/pra/abstract/10.1103/PhysRevA.91.012704
DOI: http://dx.doi.org/10.1103/PhysRevA.91.012704
Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Ambrosio, Marcelo José; Colavecchia, Flavio Dario; Mitnik, Dario Marcelo; Gasaneo, Gustavo; Discrepancy between theory and experiment in double ionization of helium by fast electrons; American Physical Society; Physical Review A: Atomic, Molecular And Optical Physics; 91; 1; 1-2015; 012704-012704, 1-4
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