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  • 1 Russian Academy of Sciences, 117977 GSP-1 Institute of Chemical Physics Kosygin st. 4 V-334 Moscow (Russia)
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Free volume effects are important for positronium formation, pick-off annihilation and chemical reactions. The relation between the long-lived component intensity and the number of defects is considered for the case of selective localization of positrons and positronium in ordered and disordered sites of plymers. Positronium lifetimes for the large pores (r1 nm) are discussed. In positronium chemical reactions recent results show crucial role of the bubble parameters in liquids.