Abstract
The dielectric constant and optical conductivity of opaque specular lithium films have been determined using a combination of ultra-high vacuum and ellipsometric techniques. The data fall into two categories which the authors associate with the BCC and HCP phases of lithium. Results for the BCC phase are in good agreement with theoretical calculation if one assumes the presence of indirect transitions which shift the experimental absorption edge to a lower photon energy. The second category of data is compatible with what is expected from HCP lithium. For all the data the intraband absorption deviates markedly from the simple omega -2 dependence and the derived relaxation time shows a significant energy dependence. No evidence for any anomalous absorption band in this alkali metal is found.
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