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Abstract
The first steps of selected solid state chemical reactions were investigated by ESR in spectral and spatial resolution. Use was made of pressure induced changes of the fine structure of Fe3+ and Mn2+ as Well as the dynamic Jahn-Teller effect of Cu2 +. Paramagnetic oxygen centres like Ox − were used to monitore the generation and emptying of traps in oxides, carbonates, silicates and alumosilicates.