AB-INITIO MOLECULAR-DYNAMICS STUDY OF THE STABILITY AND OPTICAL-PROPERTIES OF ULTRASMALL III-V HYDROGENATED CLUSTERS

We present an ab initio molecular-dynamics study of III-V hydrogenated microclusters with the purpose of identifying stable and optically ac tive structures suitable for inclusion in zeolite cages. We find that the most stable and optically active clusters are distorted tetrahedra l structures with a majority of atoms of group V. Cubic clusters show unexpected structural stability, but with negligible matrix element fo r optical transitions close to the energy gap. Our results are compati ble with existing experimental data.