1. Departamento de Física; Universidad de Santiago de Chile; Santiago Chile
2. Departamento de Física, Facultad de Ciencias; Universidad de Chile; Santiago Chile
3. Skobeltsyn Institute of Nuclear Physics; Lomonosov Moscow State University; Moscow Russia
4. Space Research Institute; Russian Academy of Science; Moscow Russia
5. Center for the development of Nanoscience and Nanotechnology; Santiago Chile