Spectroscopy of Na3 and Experiments on Size-Selected Metal Cluster Ions
The spectroscopy of Na3 has been systematically investigated with three different techniques: two-photon ionization (TPI), depletion spectroscopy (DS), and stimulated emission pumping (SEP). Four excited electronic states have been found in the range from 850 nm to 330 nm. The lifetime measurement of these states suggests that the highly excited ones are partially or totally predissociated. For this reason depletion spectroscopy has been used, and reveals the complete structure of the predissociated C-state. The Na3 ground state has been investigated using stimulated emission pumping. This allows a precise comparison with the calculations.
Photofragmentation patterns of Al n + are measured in a size-selected sputtered cluster ion beam. The results exhibit Al+ as the most probable fragment for the cluster sizes n = 3, 5 and 7. This shows that the monomer has a lower ionization potential than the cluster, as explained by recent calculations. Ion-molecule reactions of nickel clusters and carbon monoxide allow the formation of carbonyl compounds. The stoichiometry of these products correlates extremely well with simple electron counting rules.
KeywordsLower Ionization Potential Photon Ionization Nickel Cluster Electron Counting Rule Stimulate Emission Pumping
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