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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2015
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24699926_v92_n4_p_Ambrosio http://hdl.handle.net/20.500.12110/paper_24699926_v92_n4_p_Ambrosio |
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paper:paper_24699926_v92_n4_p_Ambrosio2023-06-08T16:35:58Z Double ionization of helium by proton impact: A generalized-Sturmian approach 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. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24699926_v92_n4_p_Ambrosio 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 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. |
| 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 |
| publishDate |
2015 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24699926_v92_n4_p_Ambrosio http://hdl.handle.net/20.500.12110/paper_24699926_v92_n4_p_Ambrosio |
| _version_ |
1768544708184768512 |