1. Instituto de Química
Física Rocasolano (IQFR-CSIC), Serrano 119, 28006 Madrid, Spain
2. Instituto de Estructura
de la Materia (IEM-CSIC), Serrano 121, 28006 Madrid, Spain
3. DUBBLE@ESRF, Netherlands Organisation for Scientific Research (N.W.O.), CS40220, 38043, Grenoble, Cedex 9, France