The visible and near ultraviolet absorption spectra have been measured for thin films of H2Pc [C32H18N8], MgPc, FePc, CoPc, CuPc, and ZnPc. Magnesium and iron phthalocyanine have very different absorption spectra. For most of the phthalocyanines, structure of magnitude 0.21 eV is seen on the visible and Soret bands. A d band is indicated in the region 4.0–4.7 eV. This is the spectral region most sensitive to substitutions of the central metal atom.
Pure and magnesium-doped LiF crystals have been implanted with mainly magnesium and argon ions of 100 keV energy. Fluences were in the range of 6*1015-1*1017 ions cm-2. Changes in optical absorption during thermal annealing are reported. The magnesium colloid band at 280 nm and the lithium colloid band at 520 nm are identified. Some cases of anomalous colloid growth are observed. Hidden structural factors such as dislocations are thought to produce this anomalous annealing behaviour. Magnesium colloids develop in doped crystals after the implantation of rare gas ions. The responsible mechanism is thought to involve the interaction of F centres with impurity-vacancy (IV) dipoles. We find that the dopant has little effect on the concentration of F and F2 colour centres or on their thermal stability in ion-implanted samples.
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