Optical transitions in disordered thin films of the ionic compounds MgF_2 and AlF_3 as a function of their conditions of preparation

The analysis of allowed electronic transitions in thin films of the disordered ionic compounds MgF(2) and AIF(3) was obtained by optical absorption studies in the uv region. The results are given as a function of the composition and of the degree of crystallization of the films. The characterization of the samples resulting from nuclear analysis (Rutherford backscattering and alpha-X reactions), intramolecular vibrations (ir absorption), and x-ray diffraction studies are reported.