Der Einfluß von Gitterstörungen auf die optischen Eigenschaften von Metallschichten

By condensation of metals from the vapour onto a cooled substrate an especially high degree of disorder can be frozen in. Such strongly disordered films show essential changes of their properties. This paper deals with optical studies of such films of Bi, Ga, Sn and Ag. Reflectivity and transmission and their changes during annealing are measured in the spectral range from 0,25 to 4 microns. There is reasonable agreement with results of other measurements e.g. Hall-voltage, electrical resistance and electron diffraction. Optical constants and their changes during annealing are calculated in the range from 0,8 to 4 microns by approximation formulas. The high disorder produces similar anomalies of the optical constants as observed so far at extremely thin films. Concentrations and collision frequencies of free electrons are determined by means of the Drude theory. These values, obtained by a purely optical method are compared to results of electrical measurements and show satisfactory agreement.