Atomic orbital interactions of clusters Cu-n, Ag-n, Au-n, (n = 2,3,4)
were analyzed with DV-X(alpha) method. The results showed that the int
eractions vary with the geometry of clusters, The ioniation potentials
of clusters are investigated by using the transition-state procedure,
and the calculating results for Ag( )are in agreement with the experi
mental values, however, there are some deviations between them for Au-
n, due to the larger relativistic effect of Au-n.