Photodestruction of positively and negatively charged aluminum-cluster ions

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Abstract
Relative photodestruction cross sections and fragmentation branching ratios of positively and negatively charged aluminum-cluster ions are measured as a function of photon energy for clusters of up to eight atoms. The cross sections and fragmentation branching ratios show a strong dependence on photon energy. For positive ions the cross sections generally increase with photon energy, while for negative ions a pronounced maximum in the cross section is observed near 2.0 eV. Neutral-atom evaporation is a dominant fragmentation pathway for both positive and negative clusters. Positive clusters are also found to evaporate an atomic ion. For the negative clusters, photofragmentation is suppressed for photon energies near the known electron binding energies.

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