Properties of correlated nanoscopic systems from the combined exact diagonalization — ab initio method

We review briefly our recent exact results concerning the electronic properties of atomic, molecular, and nanoscopic systems by combining the exact diagonalization and ab initio methods (EDABI). Particular emphasis is put on determining the microscopic parameters. The multiatom system behavior is discussed as a function of interatomic distance. A transformation from a nanometal (for small lattice constant) to an atomic system is observed with increasing distance between the atoms.