Cluster assemblies of metal-coated fullerenes

One of the most appealing aspects of cluster science while it was still in its infancy was the simplicity of the objects studied. More recently, clust er beam experimentalists have begun to direct their interest to more comple x condensates which might better be called cluster assemblies. We present m ass spectra of Tm-C-60 and Ho-C-60 cluster assemblies which indicate that t hey are composed of subunits of metal-covered fullerene molecules.