Multiply charged titanium cluster anions: production and photodetachment

Titanium clusters are produced by laser vaporization of a metal wire in a h elium gas pulse, stored in a Penning trap, size selected and transformed in to multiply charged anions by electron attachment. Both doubly and triply c harged titanium clusters are observed. For the first observation of photode tachment of electrons from metal cluster dianions, Ti-55(2-) clusters are s elected and excited by a laser pulse, which leads to the emission of an exc ess electron: Ti-55(2-) --> e(-) +Ti-55(-).