Abstract

Reflectance and transmittance of aggregated lithium deposits, prepared under static and dynamic ultrahigh vacuum, have been studied at normal incidence in the spectral range 1–6 eV. The structure of these deposits was determined in situ using a carbon film replication technique. It is shown that the optical conductivity exhibits peaks in the visible and infrared ranges, which are due to plasma resonance of the conduction electrons. In the uv range, the conductivity rises due to interband transitions. The particle size histograms show that deposits are made up of axially symmetrical ellipsoids. It follows that Maxwell-Garnett theory is inappropriate to describe the optical properties of granular lithium deposits. A generalized Maxwell-Garnett theory for ellipsoidal particles, which takes the interactions between particles into account, is used. Good agreement between experiment and theory is obtained.

© 1977 Optical Society of America

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