Ab initio calcns. were made for Cu clusters Cun with n = 2, 4, 6, 8 and 13. The basic sets as well as bonding parameters, total energies and binding energies were given. The configurations of S, P, and d orbitals of Cu13 clusters are given, and showed that Cu13 does not have the metallic band characteristics.

Key words: COPPER, ELECTRONIC STRUCTURE, AB INITIO CALCULATION, ATOM, ICOSAHEDRON, GROUND STATE, DISPOSITION, BINDING ENERGY, REDUCTION THEORY, BOND LENGTH