Artículo
Abstract:
Double-electron capture by the impact of heavy projectiles on heliumlike atoms is studied with a two-electron model. The process is here considered a two-step collision, which in the frame of the distorted-wave formalism is related to the second order. This second order is evaluated by using an on-shell Green function representing one electron in each center, and it is found to be related, after some approximations, to the independent-electron model. In particular, the exact impulse approximation is used to calculate the single-capture T-matrix elements, and the electronic repulsion is included as a dynamic perturbation in first order. A configuration-interaction wave function is employed to describe the ground state of helium for double capture 1s21s2 in a He2+-He collision. For this benchmark, differences with the use of a Hartree-Fock wave function instead are found to be negligible. Thereafter, capture to single excited states for the same system is calculated by using Hartree-Fock and variational electronic wave functions. Also, double capture for multiply charged ions on helium is calculated. Differential cross sections for double-capture He2+-He collisions at 60 keV/amu impact energy are presented and compared with previous experiments. The present theory produces good agreement with the available data. © 1992 The American Physical Society.
Registro:
| Documento: | Artículo |
| Título: | Double-electron capture as a two-step process |
| Autor: | Gravielle, M.S.; Miraglia, J.E. |
| Filiación: | Instituto de Astronomía y Física Del Espacio, Consejo Nacional de Investigaciones Científicas y Técnicas, 1428 Buenos Aires, Argentina |
| Año: | 1992 |
| Volumen: | 45 |
| Número: | 5 |
| Página de inicio: | 2965 |
| Página de fin: | 2973 |
| DOI: | http://dx.doi.org/10.1103/PhysRevA.45.2965 |
| Título revista: | Physical Review A |
| ISSN: | 10502947 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v45_n5_p2965_Gravielle |
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Citas:
---------- APA ----------
Gravielle, M.S. & Miraglia, J.E. (1992) . Double-electron capture as a two-step process. Physical Review A, 45(5), 2965-2973.http://dx.doi.org/10.1103/PhysRevA.45.2965
---------- CHICAGO ----------
Gravielle, M.S., Miraglia, J.E. "Double-electron capture as a two-step process" . Physical Review A 45, no. 5 (1992) : 2965-2973.http://dx.doi.org/10.1103/PhysRevA.45.2965
---------- MLA ----------
Gravielle, M.S., Miraglia, J.E. "Double-electron capture as a two-step process" . Physical Review A, vol. 45, no. 5, 1992, pp. 2965-2973.http://dx.doi.org/10.1103/PhysRevA.45.2965
---------- VANCOUVER ----------
Gravielle, M.S., Miraglia, J.E. Double-electron capture as a two-step process. 1992;45(5):2965-2973.http://dx.doi.org/10.1103/PhysRevA.45.2965
