Fragmentation Phase Transition in Atomic Clusters II - Coulomb Explosion of Metal Clusters -

Details Fragmentation Phase Transition in Atomic Clusters II - Coulomb Explosion of Metal Clusters - Fragmentation Phase Transition in Atomic Clusters II - Coulomb Explosion of Metal Clusters -

1997-02-20

arxiv.org/abs/cond-mat/9702183v1

Physics

Condensed Matter

19 text pages +18 *.eps figures, my e-mail adress: madjet@hmi.de submitted to Z. Phys. D

Scientific paper

10.1007/s004600050314

We discuss the role and the treatment of polarization effects in many-body systems of charged conducting clusters and apply this to the statistical fragmentation of Na-clusters. We see a first order microcanonical phase transition in the fragmentation of $Na^{Z+}_{70}$ for Z=0 to 8. We can distinguish two fragmentation phases, namely evaporation of large particles from a large residue and a complete decay into small fragments only. Charging the cluster shifts the transition to lower excitation energies and forces the transition to disappear for charges higher than Z=8. At very high charges the fragmentation phase transition no longer occurs because the cluster Coulomb-explodes into small fragments even at excitation energy $\epsilon^* = 0$.

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