Abstract
A series of hard-sphere cluster-ion structures have been constructed, based on the notion of a central stable dimer ion core. Starting from a structure representative of icosahedral Ar+19, two separate packing sequences are considered; edge packing and face packing, and clusters containing up to 310 atoms have been generated. It is shown that many of the symmetric structures derived from the two packing sequences coincide with the ‘‘magic’’ numbers observed both in the mass spectra and fragmentation patterns of argon and krypton cluster ions. A slice through the cluster shows that the central dimer ion core is part of a linear chain of atoms, which offer the possibility for further charge delocalization as suggested in recent molecular orbital calculations.
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