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| Format: | Artículo científico |
| Language: | en |
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Sociedade Brasileira de Física
2006
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| Online Access: | https://www.redalyc.org/articulo.oa?id=46403602 |
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Table of Contents:
- Production of 1s2s2p 4P States by Transfer-Loss Cascades in O5+ Collisions with He and H2 Targets T. J. M. Zouros B. Sulik L. Gulyás A. Orbán Física, Astronomía y Matemáticas Ion Cascade feeding atom collisions Electron capture Metastable states Single differential cross-sections for transfer-loss (TL) leading to the production of O5+(1s2s 3S)nl 4L stateswere computed for 0.2-1.2 MeV/u collisions of O5+(1s22s) ions with He and H2 targets. At these collisionenergies, 1s loss is significant and electron transfer to n = 3¡4 levels is dominant. Furthermore, due to spinconservation, quartet states can only be populated by TL.Within the independent particle model (IPM), the probabilityof 1s electron loss from O5+(1s22s) projectiles was calculated using the semi-classical approach, whilethe probability for electron transfer to the O5+(1s2s 3S)nl 4L states (n ¸ 2) was computed using the continuumdistorted wave (CDW) approximation. The majority of states with n > 2 can be assumed to have sufficient timeto eventually decay with an almost 100% probability to the long-living metastable 1s2s2p 4P level via a muchfaster sequence of electric dipole transitions, thus establishing an upper limit to such cascade contributions. Theinclusion of this cascade feeding is found to lead to a strong enhancement in the production of the 1s2s2p 4Pstates, particularly for collisions with the H2 target, thus reducing dramatically the existing two-order of magnitudediscrepancy between older TL calculations (for n = 2 only) and existing zero-degree Auger projectileelectron spectroscopy measurements. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46403602 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.2B Vol.36