Structure and interactions of clusters

Ordered structures, which are characterized by the numbers T-1 and T-2 of n earest and next-nearest neighbors of the same kind in T-1, T-2 structure ma ps, can be classified in enthalpy and entropy stabilized structures. 111 th ree-dimensional structures MxNy with identical T-i values of all M and N pa rticles were determined for the three-dimensional lattices. The numbers of shells were extended to i = 11-18 to compare the values for closed shells w ith the magic numbers a: and y of isotopes (M = proton, N = neutron) or sma ll clusters MxNy or M(x)square(y) (square = vacancy). Electroneutral cluste rs were derived for 42 structures with x not equal y. Colloidal DNA or prot eins are clusters with different T-i values of each structural unit within long chains.