Probing the geometry of Ar2N2 cluster by 1Â MeV Ne8+ ions

By employing Reaction Microscopes, we investigated the geometric conformation of Ar2N2 cluster for the first time. The momentum vectors of three correlated singly charged fragments Ar+/Ar+/N2+ from (Ar2N2)3+ three-body fragmentations induced by 1 MeV Ne8+ ions are measured in coincidence. Considering N2 as a whole, the triangular geometry is directly identified. The results agree well with the conformation of theoretical prediction (Lucchese and Gianturco, 1997).