  The fragmentation of multiply charged atomic sodium clusters of mass 200 is
investigated using the Micro-canonical Metropolis Monte Carlo (MMMC)
statistical technique for excitation energies up to 200 eV and for cluster
charges up to $+9e$. In this work we present caloric curves and charged and
uncharged fragment mass distributions for clusters with charges 0, 2, and 4.
The caloric curves show a dip at the critical point implying a negative
specific heat, as expected for finite systems, while the fragment mass
distributions corroborate the picture of a phase transition from one dominant
liquid-like cluster to complete vaporization.
