Abstract
The static electric dipole polarizabilities of isolated Ga N As M clusters with N + M = 4–30 atoms and approximatly 1:1 composition have been measured in dependence of the cluster size N + M by means of a molecular beam deflection technique. A striking size-dependent behaviour has been observed for small Ga N As M clusters with up to 15 atoms. Within this size range the polarizability oscillates strongly between low values for even and high values for odd numbers of atoms N + M. For clusters with N + M < 12 the polarizability of gallium rich clusters is significantly larger than the values obtained for arsenic rich clusters whereas the opposite effect was observed for larger clusters with N + M >12.
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