Electric dipole polarizabilities of copper clusters

摘要

The static electric dipole polarizabilities of Cu_9-Cu_(61) have been measured via a molecular beam deflection method.The clusters display per-atom polarizabilities that decrease monotonically with size,from approx16 A~3 per atom Cu_(9_10) to approx5 A~3 (Cu_(45_61)).Absent are any discernible discontinuities or odd-even alternations due to electronic shell filling or electron pairing effects.For the smallest clusters,the experimental polarizabilities are approx3 times larger than those predicted classically for conducting ellipsoids,and approach the classical values only for clusters containing more than approx45 atoms.