A simple electrostatic model permits the estimation of Auger parameter shifts of core-ionized atoms in compounds with respect to the free atom in the gas phase. It is shown that the Auger parameter shift is a function of the number, distance, electronic polarizability and local geometry of the nearest-neighbour ligands around the core-ionized atom. We have investigated the relationship between the Cu Auger parameter shifts and the nuclearity of Cu clusters entrapped in A zeolites. It is shown that our model is useful to estimate this dependence. The model has also been applied with success to rationalize Auger parameter data on small copper clusters supported on alpha-Al2O3 (0001) surfaces and polycrystalline ZnO and graphite. We demonstrate that the screening properties of metal bulk and clusters of very low nuclearity are very similar.
APPLICATION OF THE AUGER PARAMETER IN THE CHARACTERIZATION OF SMALL COPPER PARTICLES SUPPORTED ON INSULATORS / Moretti, Giuliano; Porta, Piero. - In: SURFACE SCIENCE. - ISSN 0039-6028. - STAMPA. - 287:PART 2(1993), pp. 1076-1081. (Intervento presentato al convegno 8TH INTERNATIONAL CONF ON SOLID SURFACES ( ICSS-8 ) / 12TH INTERNATIONAL VACUUM CONGRESS ( IVC-12 ) tenutosi a THE HAGUE, NETHERLANDS nel OCT 12-16, 1992) [10.1016/0039-6028(93)91130-h].
APPLICATION OF THE AUGER PARAMETER IN THE CHARACTERIZATION OF SMALL COPPER PARTICLES SUPPORTED ON INSULATORS
MORETTI, GIULIANO;PORTA, Piero
1993
Abstract
A simple electrostatic model permits the estimation of Auger parameter shifts of core-ionized atoms in compounds with respect to the free atom in the gas phase. It is shown that the Auger parameter shift is a function of the number, distance, electronic polarizability and local geometry of the nearest-neighbour ligands around the core-ionized atom. We have investigated the relationship between the Cu Auger parameter shifts and the nuclearity of Cu clusters entrapped in A zeolites. It is shown that our model is useful to estimate this dependence. The model has also been applied with success to rationalize Auger parameter data on small copper clusters supported on alpha-Al2O3 (0001) surfaces and polycrystalline ZnO and graphite. We demonstrate that the screening properties of metal bulk and clusters of very low nuclearity are very similar.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
