Ab Initio Calculations for the Polarizabilities of Small Sulfur Clusters

Polarizabilities of small S_n (n=2--8) clusters are calculated by using the higher-order finite- difference pseudopotential density functional method in real space. We find that the polarizabilities of the clusters are considered to be higher than the value estimated from the ``hard sphere'' model using the bulk static dielectric constant. The computed polarizabilities per atom tend to decrease with the increasing cluster size. The polarizabilities are closely related to the HOMO-LUMO gaps and the geometrical configurations.