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

Mostrar todas las versiones(2)

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. Th...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Ambrosio, M.J., Colavecchia, F.D., Mitnik, D.M., Gasaneo, G.
Formato: JOUR
Materias:
Electron emission
Helium
Projectiles
Convergent close-coupling calculations
Electron emission energy
Fully differential cross sections
High impact energy
Low momentum transfers
Projectile target interaction
Sturmian functions
Theoretical methods
Ionization
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10502947_v91_n1_p_Ambrosio
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_10502947_v91_n1_p_Ambrosio
record_format dspace
spelling todo:paper_10502947_v91_n1_p_Ambrosio2023-10-03T16:00:22Z Discrepancy between theory and experiment in double ionization of helium by fast electrons Ambrosio, M.J. Colavecchia, F.D. Mitnik, D.M. Gasaneo, G. Electron emission Helium Projectiles Convergent close-coupling calculations Electron emission energy Fully differential cross sections High impact energy Low momentum transfers Projectile target interaction Sturmian functions Theoretical methods Ionization 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)JPAPEH0953-407510.1088/0953-4075/32/21/301] 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. © 2015 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_v91_n1_p_Ambrosio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Electron emission
Helium
Projectiles
Convergent close-coupling calculations
Electron emission energy
Fully differential cross sections
High impact energy
Low momentum transfers
Projectile target interaction
Sturmian functions
Theoretical methods
Ionization
spellingShingle Electron emission
Helium
Projectiles
Convergent close-coupling calculations
Electron emission energy
Fully differential cross sections
High impact energy
Low momentum transfers
Projectile target interaction
Sturmian functions
Theoretical methods
Ionization
Ambrosio, M.J.
Colavecchia, F.D.
Mitnik, D.M.
Gasaneo, G.
Discrepancy between theory and experiment in double ionization of helium by fast electrons
topic_facet Electron emission
Helium
Projectiles
Convergent close-coupling calculations
Electron emission energy
Fully differential cross sections
High impact energy
Low momentum transfers
Projectile target interaction
Sturmian functions
Theoretical methods
Ionization
description 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)JPAPEH0953-407510.1088/0953-4075/32/21/301] 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. © 2015 American Physical Society.
format JOUR
author Ambrosio, M.J.
Colavecchia, F.D.
Mitnik, D.M.
Gasaneo, G.
author_facet Ambrosio, M.J.
Colavecchia, F.D.
Mitnik, D.M.
Gasaneo, G.
author_sort Ambrosio, M.J.
title Discrepancy between theory and experiment in double ionization of helium by fast electrons
title_short Discrepancy between theory and experiment in double ionization of helium by fast electrons
title_full Discrepancy between theory and experiment in double ionization of helium by fast electrons
title_fullStr Discrepancy between theory and experiment in double ionization of helium by fast electrons
title_full_unstemmed Discrepancy between theory and experiment in double ionization of helium by fast electrons
title_sort discrepancy between theory and experiment in double ionization of helium by fast electrons
url http://hdl.handle.net/20.500.12110/paper_10502947_v91_n1_p_Ambrosio
work_keys_str_mv AT ambrosiomj discrepancybetweentheoryandexperimentindoubleionizationofheliumbyfastelectrons
AT colavecchiafd discrepancybetweentheoryandexperimentindoubleionizationofheliumbyfastelectrons
AT mitnikdm discrepancybetweentheoryandexperimentindoubleionizationofheliumbyfastelectrons
AT gasaneog discrepancybetweentheoryandexperimentindoubleionizationofheliumbyfastelectrons
_version_ 1807316433196023808

Ejemplares similares