Abstract
Positron lifetime measurements have been carried out for five solid and liquid n-higher aliphatic alcohols (dodecanol, tetradecanol, hexadecanol, eicosanol and docosanol) in wide temperature ranges. Positronium formation processes in the studied alcohols are analysed in terms of the spur reaction model. Among others, the localisation mechanims of e −, e + in dipole traps in liquid and in solid rotator phases and the influence of the changes of the electron-positron critical distance and their thermalization ranges on Ps formation probability are discussed. Free volume distribution, defect generation, crystal impurities and phase transition dynamics influence additionally the Ps fraction in solid alcohols as in many other molecular crystals. The Ps trapping mechanism in defects (vacancies and other stable or unstable lattice voids) of the rotator phases is also discussed.
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