Me. Madjet et al., FRAGMENTATION PHASE-TRANSITION IN ATOMIC CLUSTERS-II - SYMMETRY OF FISSION OF METAL-CLUSTERS, Zeitschrift fur Physik. D, Atoms, molecules and clusters, 39(4), 1997, pp. 309-316
We present a statistical fragmentation study of doubly charged alkali
(Li, Na, K) and antimony clusters, The evaporation of one charged trim
er is the most dominant decay channel (asymmetric fission) at low exci
tation energies. For small sodium clusters this was quite early found
in molecular dynamical calculations by Landman et al. [1]. For doubly
charged lithium clusters, we predict Li-9(+) to be the preferential di
ssociation channel. As already seen experimentally a more symmetric fi
ssion is found for doubly charged antimony clusters. This different be
havior compared to the alkali metal clusters is in our model essential
ly due to a larger fissility of antimony. This is checked by repeating
the calculations for Na-52(++) with a bulk fissility parameter set ar
tificially equal to the value of Sb.