3 TYPES OF STABLE STRUCTURES OF HYDROGENATED SILICON CLUSTERS

We have studied stable structures of hydrogenated Si clusters grown fr om silane gas in an ion trap developed for cluster growth, The grown c lusters were extracted from the ion trap through two different pathway s and were analyzed by mass spectrometers. The Si6Hx+ cations were sta bly grown, among them clusters with x = 1, 7, and 13 were always obser ved, regardless of the growth conditions or the extraction pathways. T he stable structures of these clusters were theoretically investigated . Clusters of x = 1, 7, and 13 corresponded to the compact structure, the intermediate structure which has both compact and bulklike configu rations, and the bulklike sp(3) structure, respectively. (C) 1997 Amer ican Institute of Physics.