Double ionization of helium by proton impact: from intermediate to high momentum transfer

Abstract: We study theoretically the double ionization of helium by 6 MeV proton impact. For such fast projectiles, when considering the projectile-target interaction to first order, the four-body Schrödinger equation reduces to solving a three-body driven equation. We solve it with a generalized St...

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Publicado: 2017
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346060_v71_n5_p_Ambrosio
http://hdl.handle.net/20.500.12110/paper_14346060_v71_n5_p_Ambrosio
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_14346060_v71_n5_p_Ambrosio2023-06-08T16:15:36Z Double ionization of helium by proton impact: from intermediate to high momentum transfer Abstract: We study theoretically the double ionization of helium by 6 MeV proton impact. For such fast projectiles, when considering the projectile-target interaction to first order, the four-body Schrödinger equation reduces to solving a three-body driven equation. We solve it with a generalized Sturmian functions approach and, without evaluating a transition matrix element, we extract the transition amplitude directly from the asymptotic limit of the first order scattering solution. Fivefold differential cross sections (FDCS) are calculated for the double ionization process for a number of coplanar kinematical situations. We present a detailed theory-experiment comparison for intermediate momentum transfers (from 0.8 to 1.2 a.u. and from 1.4 to 2.0 a.u.). In spite of some experimental restrictions (energy and momentum ranges) and the low count rates, we found that our theoretical description provides a very satisfactory reproduction of the measured data on relative scale. We then explore how the binary, recoil and back-to-back structures change with increasing momentum transfers (0.853 to 1.656, to 3.0 a.u.). Within the impulsive regime, with a momentum transfer of 3.0 a.u., we also analyze the FDCS for different excess energies. Finally, in analogy to an experimentalist gathering electrons with different excess energies to obtain enough counts, we provide a collective FDCS prediction that hopefully will stimulate further measurements. Graphical abstract: [Figure not available: see fulltext.]. © 2017, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346060_v71_n5_p_Ambrosio http://hdl.handle.net/20.500.12110/paper_14346060_v71_n5_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)
description Abstract: We study theoretically the double ionization of helium by 6 MeV proton impact. For such fast projectiles, when considering the projectile-target interaction to first order, the four-body Schrödinger equation reduces to solving a three-body driven equation. We solve it with a generalized Sturmian functions approach and, without evaluating a transition matrix element, we extract the transition amplitude directly from the asymptotic limit of the first order scattering solution. Fivefold differential cross sections (FDCS) are calculated for the double ionization process for a number of coplanar kinematical situations. We present a detailed theory-experiment comparison for intermediate momentum transfers (from 0.8 to 1.2 a.u. and from 1.4 to 2.0 a.u.). In spite of some experimental restrictions (energy and momentum ranges) and the low count rates, we found that our theoretical description provides a very satisfactory reproduction of the measured data on relative scale. We then explore how the binary, recoil and back-to-back structures change with increasing momentum transfers (0.853 to 1.656, to 3.0 a.u.). Within the impulsive regime, with a momentum transfer of 3.0 a.u., we also analyze the FDCS for different excess energies. Finally, in analogy to an experimentalist gathering electrons with different excess energies to obtain enough counts, we provide a collective FDCS prediction that hopefully will stimulate further measurements. Graphical abstract: [Figure not available: see fulltext.]. © 2017, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.
title Double ionization of helium by proton impact: from intermediate to high momentum transfer
spellingShingle Double ionization of helium by proton impact: from intermediate to high momentum transfer
title_short Double ionization of helium by proton impact: from intermediate to high momentum transfer
title_full Double ionization of helium by proton impact: from intermediate to high momentum transfer
title_fullStr Double ionization of helium by proton impact: from intermediate to high momentum transfer
title_full_unstemmed Double ionization of helium by proton impact: from intermediate to high momentum transfer
title_sort double ionization of helium by proton impact: from intermediate to high momentum transfer
publishDate 2017
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346060_v71_n5_p_Ambrosio
http://hdl.handle.net/20.500.12110/paper_14346060_v71_n5_p_Ambrosio
_version_ 1768542803930906624

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