Some differences in the exponential tail behaviour of the fundamental absorption edge in amorphous and crystalline materials

Some characteristics of optical absorption in the fundamental absorption tail are studied using the parameter which describes the shape of the optical absorption edge of crystalline and amorphous materials. It follows from the experimental data that depends on the morphological state of material. Further, very pronounced linear temperature dependence of was found for crystalline materials whereas only a weak dependence was found for amorphous materials. A unique point of intersection has been observed for all the=f(T) lines pertinent to various crystalline materials in unpolarized light.Lumumbova 1, Praha 8, Czechoslovakia.The author thanks Dr. A. Vako for his attention paid to this work.