Photofragmentation of stored cluster ions

2008 
Small metal clusters were produced by laser desorption and transferred into a Penning trap. They were illuminated by a 20‐ns dye‐laser pulse and electronically excited. Relaxation channels were investigated in the case of positively charged gold and silver clusters evaporation of neutral atoms or dimers (depending on photon energy and number of cluster atoms) was observed. Photoabsorption cross section measurements of Au9+. For Au21+ yield a resonance similar to the one already known for Ag9+. For Au21+ and Ag21+ a delayed photofragmentation in the millisecond range has been observed.
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