MICROCLUSTER IOPTICAL ABSORPTION SPECTRA OF AG-MICROCLUSTERS FORMED BY MATRIX TECHNIQUES

W. Schulze , Hanna Becker , D. Leutloff

Silver microclusters have been prepared by co-condensation of a monoatomic silver beam with an excess of noble gas on a cooled sapphire target and investigated by optical transmission spectroscopy in the U.V.-VIS. range. Depending on the condensation parameters (i.e. temperature, gas/metal ratio, the gas admission rate and the gas itself) the condensing metal atoms can either be isolated as single atoms or as a mixture of aggregates at the surface of the growing matrix layer. The optical absorption spectra of such mixtures show several distinct absorption bands within the range 2 000-5 000 Å. The spectral features of monoatomic and diatomic silver can be clearly identified, allowing the remaining bands to be assigned to multimeric silver particles.

Domaines: Articles anciens

W. Schulze, Hanna Becker, D. Leutloff. MICROCLUSTER IOPTICAL ABSORPTION SPECTRA OF AG-MICROCLUSTERS FORMED BY MATRIX TECHNIQUES. Journal de Physique Colloques, 1977, 38 (C2), pp.C2-7-C2-10. ⟨10.1051/jphyscol:1977202⟩. ⟨jpa-00217035⟩