Temperature, Pressure & Solvent Dependence of Positronium Acceptor Reactions

Details Temperature, Pressure & Solvent Dependence of Positronium Acceptor Reactions Temperature, Pressure & Solvent Dependence of Positronium Acceptor Reactions

2000-07-17

arxiv.org/abs/physics/0007053v1

Physics

Chemical Physics

7 pages, 3 figures, communicated to PRL

Scientific paper

Positronium (Ps) reaction rates (k) with weak Acceptors (Ac) leading to the formation of Ps-Ac Complexes show several intriguing features: non-monotonic temperature dependence of k (departing from the usual Arrhenius paradigm), considerable variablity of k with respect to different solvents, and anomalies in response to external pressure at ambient temperature (large changes of k in some media and hardly any in others). We explain all these phenomena, through the introduction of the novel concept of a critical surface tension, which unifies observations in diverse non-polar solvents at different temperatures and pressures.

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