1. Department of Chemistry, Universidad Nacional de Colombia, Av. Cra 30 45-03, Bogotá, Colombia
2. Department of Physics, AlbaNova University Center, Stockholm University, Stockholm, 106 91, Sweden
3. Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg City, Luxembourg
4. Instituto de Física, Universidade de São Paulo, Rua do Matão 1731, 05508-090 São Paulo, Brazil
5. Departamento de Química, Universidad de Guadalajara, Blvd. Marcelino García Barragán 1421, Col Olímpica, Guadalajara Jal., C.P. 44430, Mexico