Abstract
The optical constants of gold have been determined for photon energies 0.5 to 6.0 eV by internal reflection from annealed gold films on silica glass prisms. The interband part of the absorption is compared with previous values and the weak absorption band near 1.4 eV is confirmed. The effective number of conduction electrons p r atom, n ∗, is derived from infrared values of the dielectric constant. It is suggested that variations in the apparent value of n ∗ may be explained by the presence of vacancies in the skin layer. The temperature variation of optical conductivity in the i.r. is used to separate the electron-phonon term from the total collision frequency. Electron scattering at the film surface is found to be partly specular.
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