Sims Characterization Of Hetero-Isotopic Cluster Ions Of Lithium-Fluoride

Fast atom bombardment and secondary ion mass spectroscopy are used to study the characteristics of ion clusters sputtered from lithium fluoride crystal. Two types of cluster ions, Li(LiF) N are identified. Large amounts of hetero-isotopic clusters are observed in both cases and isotopic effects exist in the formation of lithium fluoride ion clusters, another important property of alkali halides following ‘magic numbers’ in SIMS mass spectrum.