Showing papers by "Shuit-Tong Lee published in 1981"
TL;DR: In this paper, the authors show that a minimum size in excess of 100 atoms is required to observe any of the spectral modulation effects characteristic of the bulk metal in gold clusters with variable photon energies.
Abstract: Photoemission studies of gold clusters with variable photon energies, $16\ensuremath{\le}h\ensuremath{
u}\ensuremath{\le}25$ eV and $h\ensuremath{
u}=1486.6$ eV, are used to follow the evolution of band structure with cluster size. We clearly show that a minimum size in excess of 100 atoms is required to observe any of the spectral modulation effects characteristic of the bulk metal.
81 citations
TL;DR: In this paper, the authors used a model in which band narrowing, due to reduced surface coordination, is more dominant than surface tension effects in establishing the valence of small samarium clusters.
Abstract: Samarium clusters exhibit mixed-valence behavior which is sensitive to particle size. XPS and UPS data show samarium to be primarily divalent (4f{sup 6} ) at small particle size. The trivalent state (4f{sup 5} ) becomes progressively more abundant with increasing s1ze, becoming the dominant state for the bulk metal. These results are interpreted using a model in which band narrowing, due to reduced surface coordination, is more dominant than surface tension effects in establishing the valence of small samarium clusters.
57 citations
TL;DR: In this article, the authors compared the UV photoemission spectra of valence electrons in small silver clusters with spectra from bulk silver samples using synchrotron radiation, and found that with increased cluster size, both density of states and valence band modulations with respect to photon energy resemble the bulk metal more closely.
44 citations