1. Institute of Inorganic and Analytical Chemistry, Justus-Liebig University Giessen, Schubertstrasse 60, Building 16, D-35392, Giessen, Germany
2. Institut de Police Scientifique, Lausanne University, BCH Dorigny, CH-1015, Lausanne, Switzerland
3. Department of Physics, Escuela Politécnica Nacional, Ladron Guevara N.N. Ed. Ing. Civil, Piso 1, Apdo, 17012759, Quito, Ecuador