1. Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS,
Avenue de la Terrasse, 91198 Gif-sur-Yvette, France
2. Surface and Nanoanalysis, National Physical Laboratory (NPL) Teddington, Middlesex, TW11
0LW, United Kingdom
3. ION-TOF GmbH, Heisenbergstr.15, 48149 Münster,
Germany