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The fragmentation of multiply charged atomic sodium clusters of mass 200 isinvestigated using the Micro-canonical Metropolis Monte Carlo (MMMC)statistical technique for excitation energies up to 200 eV and for clustercharges up to $+9e$. In this work we present caloric curves and charged anduncharged fragment mass distributions for clusters with charges 0, 2, and 4.The caloric curves show a dip at the critical point implying a negativespecific heat, as expected for finite systems, while the fragment massdistributions corroborate the picture of a phase transition from one dominantliquid-like cluster to complete vaporization.Comment: 19 pages, 11 figures. submitted to EPJ

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

On the fragmentation of multiply charged sodium clusters