Double ionization of helium by proton impact: A generalized-Sturmian approach

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 n...

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Autores principales:	Ambrosio, M.J., Mitnik, D.M., Ancarani, L.U., Gasaneo, G., Gaggioli, E.L.
Formato:	JOUR
Materias:	Calculations Helium Ab initio calculations Asymptotic behaviors Fully differential cross sections Perturbative method Perturbative treatment Projectile target interaction Sturmian functions Transition matrices Ionization
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_24699926_v92_n4_p_Ambrosio
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_24699926_v92_n4_p_Ambrosio
record_format	dspace
spelling	todo:paper_24699926_v92_n4_p_Ambrosio2023-10-03T16:41:28Z Double ionization of helium by proton impact: A generalized-Sturmian approach Ambrosio, M.J. Mitnik, D.M. Ancarani, L.U. Gasaneo, G. Gaggioli, E.L. Calculations Helium Ab initio calculations Asymptotic behaviors Fully differential cross sections Perturbative method Perturbative treatment Projectile target interaction Sturmian functions Transition matrices Ionization 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_24699926_v92_n4_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	Calculations Helium Ab initio calculations Asymptotic behaviors Fully differential cross sections Perturbative method Perturbative treatment Projectile target interaction Sturmian functions Transition matrices Ionization
spellingShingle	Calculations Helium Ab initio calculations Asymptotic behaviors Fully differential cross sections Perturbative method Perturbative treatment Projectile target interaction Sturmian functions Transition matrices Ionization 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
topic_facet	Calculations Helium Ab initio calculations Asymptotic behaviors Fully differential cross sections Perturbative method Perturbative treatment Projectile target interaction Sturmian functions Transition matrices Ionization
description	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.
format	JOUR
author	Ambrosio, M.J. Mitnik, D.M. Ancarani, L.U. Gasaneo, G. Gaggioli, E.L.
author_facet	Ambrosio, M.J. Mitnik, D.M. Ancarani, L.U. Gasaneo, G. Gaggioli, E.L.
author_sort	Ambrosio, M.J.
title	Double ionization of helium by proton impact: A generalized-Sturmian approach
title_short	Double ionization of helium by proton impact: A generalized-Sturmian approach
title_full	Double ionization of helium by proton impact: A generalized-Sturmian approach
title_fullStr	Double ionization of helium by proton impact: A generalized-Sturmian approach
title_full_unstemmed	Double ionization of helium by proton impact: A generalized-Sturmian approach
title_sort	double ionization of helium by proton impact: a generalized-sturmian approach
url	http://hdl.handle.net/20.500.12110/paper_24699926_v92_n4_p_Ambrosio
work_keys_str_mv	AT ambrosiomj doubleionizationofheliumbyprotonimpactageneralizedsturmianapproach AT mitnikdm doubleionizationofheliumbyprotonimpactageneralizedsturmianapproach AT ancaranilu doubleionizationofheliumbyprotonimpactageneralizedsturmianapproach AT gasaneog doubleionizationofheliumbyprotonimpactageneralizedsturmianapproach AT gaggioliel doubleionizationofheliumbyprotonimpactageneralizedsturmianapproach
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Double ionization of helium by proton impact: A generalized-Sturmian approach

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