Electronic structure and dynamics of ordered clusters with ME or RE ions on oxide surface

Selected data of ab initio simulation of the electronic structure and spectral properties of either cluster with ions of iron, rare earth or actinium group elements have been presented here. Appearance of doped Cr⁺⁴ ions in oxides, Cu⁺² in HTSC, Nd⁺² in solids has been discussed. Analysis of experimental data for plasma created ordered structures of crystallites with size of about 10^-9 m on surface of separate oxides are given, too. Change in the spectroscopic properties of clusters and nano-structures on surface of strontium titanate crystals discussed shortly using the X-ray line spectroscopy experimental results.