M. Manninen et al., SHELL STRUCTURE AND LEVEL SPACING DISTRIBUTION IN METALLIC CLUSTERS, Zeitschrift fur Physik. D, Atoms, molecules and clusters, 26(1-4), 1993, pp. 28-32
The lattice gas Monte Carlo and tight binding method is used to study
the electronic shell structure in large metallic clusters. The average
density of states of a large ensemble of deformed clusters shows the
same shell structure as the most spherical geometry. The level spacing
distribution at the Fermi level is a Wigner distribution.