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On the Manifestation of Electronic Structure Effects in Metal Clusters by Manfred M. Kappes; Martin Schär; Peter Radi; Ernst Schumacher is a Physics and Astronomy article available to read on EtoBox.

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Potasium (Kx x < 40) and sodium (Na x ' x < 66) clusters were generated in molecular beams and probed by photoionization mass spectroscopy. Results obtained include measurements of neutral cluster abundances and determinations of ionization potentials. The I. P. values can be rationalized in terms of a global electrostatic model which extrapolates to the bulk work function. This model also applies to transition metals as can be shown by comparing it to the limited experimental data sets available. The I. P.'s ofsmall clusters exhibit "quantum size" effects which can be understood by individual quantum chemical calculations. As previously found for sodium clusters, photoionization mass spectra obtained for potassium, mixed potassium/sodium and potassiumllithium exhibit abundance maxima at Ms+ and Mit, where M is an alkali metal. This has been interpreted in terms of increased thermodynamic stability of the corresponding neutrals relative to neighboring clusters. We present data which show that a sphericaljellium model, while providing a set of numbers correlating well with those of preferred stability in alkali clusters, is less successful in explaining other properties.

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Author

Manfred M. Kappes; Martin Schär; Peter Radi; Ernst Schumacher

Published

1986

Language

EN

Field

Physics and Astronomy (Physical Sciences)