1. Departamento de Física, Instituto Tecnológico de Aeronáutica (ITA), 12228-900 São José dos Campos/SP, Brazil
2. Physics Department and IRIS Adlershof, Humboldt-Universität zu Berlin and European Theoretical Spectroscopy Facility (ETSF), Zum Großen Windkanal 6, D-12489 Berlin, Germany