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Computed positron lifetimes in vacancies and vacancy-iron clusters in gold |
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| Authors: | C. Corbel M. Puska R. M. Nieminen |
| Affiliation: | 1. Section d? Etudes des Solides Irradiés , CEN-FAR, 92260, Fontenay-aux-Roses , France;2. Laboratory of Physics , Helsinki University of Technology , SF-02150 , Espoo 15 , Finland;3. Department of Physics , University of Jyvaskyla , 40100 , Jyvaskyla , Finland |
| Abstract: | Annihilation characteristics are calculated for positrons trapped in clean and impurity decorated vacancy clusters in Au. The positron lifetime depends strongly on the structure of the clusters. In a strongly relaxed vacancy cluster, the lifetime can become smaller than the lifetime in a single vacancy. The substitution of some neighbour atoms of a vacancy cluster by Fe atoms has only a minor effect on the positron lifetimes. |
| Keywords: | Luminescence Cation exciton Synchrotron radiation Sodium halides |