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Free keywords:
Optical-properties; Metal-clusters; Silver films; Na clusters; Spectroscopy; Particles; Surfaces; Images; Growth; Visualization; Physical chemistry/chemical physics
Abstract:
Extinction spectra of alkali cluster films on mica substrates are recorded as a function of alkali metal deposition time. They are reproduced quantitatively by theoretical spectra of oblate spheroids, using cluster number density n, average cluster semi-axis [a] parallel to the mica surface, and mean ellipticity [R-perpendicular to] perpendicular to the surface obtained from scanning force microscopy images. It is found that reliable values of average cluster semi-axes can be obtained from optical spectra only by taking the distribution of perpendicular-plane ellipticities into account.
