Abstract
The stability of multiply charged clusters of polycyclic aromatic hydrocarbons (PAHs) is theoretically investigated. We propose a new model (stacked structure model) for fragmentation of PAH clusters. The appearance size, a minimum cluster size such that the cluster remains stable when multiply ionized, is calculated by our new model as well as by the conventional liquid drop model. The appearance sizes for doubly charged clusters of anthracene and coronene calculated by the two models are found to be much smaller than those observed in the experiments. Possible reasons for the discrepancy are discussed.
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