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Abstract:

We present ab initio calculations for the double ionization of helium by fast proton impact, using the generalized-Sturmian-functions methodology and within a perturbative treatment of the projectile-target interaction. The cross-section information is extracted from the asymptotic behavior of the numerical three-body function that describes the emission process. Our goal is to provide benchmark first-order Born fully differential cross sections with which one may investigate the suitability of transition matrices calculated using approximate analytic-type solutions for the double continuum (the choice of effective charges or effective momenta to partially account for the internal target interactions being, to some extent, arbitrary). We also provide fully differential cross sections for the low-ejection-energy regime, which is beyond the suitable range of such perturbative methods. We find, however, that the effective momentum approach allows one to get at least a rough characterization of the most dominant physical process involved. We also compare our calculations with the only available relative experimental set, showing an agreement in shape that can be well understood within the given momentum transfer regime. © 2015 American Physical Society.

Registro:

Documento: Artículo
Título:Double ionization of helium by proton impact: A generalized-Sturmian approach
Autor:Ambrosio, M.J.; Mitnik, D.M.; Ancarani, L.U.; Gasaneo, G.; Gaggioli, E.L.
Filiación:Instituto de Astronomía y Física Del Espacio (IAFE, CONICET-UBA), Casilla de Correo 67-Sucursal 28, Ciudad Autónoma de Buenos Aires, C1428ZAA, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
Orie, Modélisation, Simulation, SRSMC, UMR CNRS 7565, Université de Lorraine, Metz, 57078, France
Departamento de Física, Universidad Nacional Del sur, Bahía Blanca, Buenos Aires, 8000, Argentina
Palabras clave:Calculations; Helium; Ab initio calculations; Asymptotic behaviors; Fully differential cross sections; Perturbative method; Perturbative treatment; Projectile target interaction; Sturmian functions; Transition matrices; Ionization
Año:2015
Volumen:92
Número:4
DOI: http://dx.doi.org/10.1103/PhysRevA.92.042704
Título revista:Physical Review A
Título revista abreviado:Phys. Rev. A
ISSN:24699926
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24699926_v92_n4_p_Ambrosio

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Citas:

---------- APA ----------
Ambrosio, M.J., Mitnik, D.M., Ancarani, L.U., Gasaneo, G. & Gaggioli, E.L. (2015) . Double ionization of helium by proton impact: A generalized-Sturmian approach. Physical Review A, 92(4).
http://dx.doi.org/10.1103/PhysRevA.92.042704
---------- CHICAGO ----------
Ambrosio, M.J., Mitnik, D.M., Ancarani, L.U., Gasaneo, G., Gaggioli, E.L. "Double ionization of helium by proton impact: A generalized-Sturmian approach" . Physical Review A 92, no. 4 (2015).
http://dx.doi.org/10.1103/PhysRevA.92.042704
---------- MLA ----------
Ambrosio, M.J., Mitnik, D.M., Ancarani, L.U., Gasaneo, G., Gaggioli, E.L. "Double ionization of helium by proton impact: A generalized-Sturmian approach" . Physical Review A, vol. 92, no. 4, 2015.
http://dx.doi.org/10.1103/PhysRevA.92.042704
---------- VANCOUVER ----------
Ambrosio, M.J., Mitnik, D.M., Ancarani, L.U., Gasaneo, G., Gaggioli, E.L. Double ionization of helium by proton impact: A generalized-Sturmian approach. Phys. Rev. A. 2015;92(4).
http://dx.doi.org/10.1103/PhysRevA.92.042704