Dissociative excitation and fragmentation cross section of HeH+ molecular ions in collision with He
We investigated H+ and He+ fragment production from the dissociation of HeH+ ions in collision with a He target. This occurs through either the He++H or the He+H+ channel. We also investigated He2+ and H- production, which are three orders of magnitude smaller than those for H+ and He+. The He+/H ch...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2002 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Sistema de Información de la Facultad de Ciencias, UNAM |
| OAI Identifier: | oai:repositorio.fciencias.unam.mx:11154/2522 |
| Acceso en línea: | http://hdl.handle.net/11154/2522 |
| Access Level: | acceso abierto |
| Palabra clave: | Optics Physics, Atomic, Molecular & Chemical |
| Sumario: | We investigated H+ and He+ fragment production from the dissociation of HeH+ ions in collision with a He target. This occurs through either the He++H or the He+H+ channel. We also investigated He2+ and H- production, which are three orders of magnitude smaller than those for H+ and He+. The He+/H channel seems to be favored over the H+/He channel at all acceleration energies as well as at all ion source pressures. The H+ and He+ cross sections appear to be independent of the acceleration energy while they show significant dependence on ion source pressures. The center of mass energy distribution for both H+ and He+ shows a kinetic energy release of near zero eV. Our results suggest that the initial state of the parent HeH+ molecular ions is that of a mixture of ground electronic state as well as metastable excited states with the a (3)Sigma(+) dominant. |
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