Positron and Positronium Atom in Molecular Liquids

Abstract:

Here we discuss the e⁺ fate from its injection into a liquid till its annihilation, namely: 1) energy losses and track structure of fast positrons. Parameters of the terminal e⁺ blob; 2) electric interaction between blob constituents; 3) picosecond stage: hot (epithermal), quasi-free (dry), solvated (hydrated) e^- and e⁺, capture of hot particles by a scavenger; 4) positronium formation in condensed matter: the Ore model, the diffusion-recombination model, formation of quasi-free Ps and Ps in a bubble, a “non-point” positronium; 5) application of an external magnetic field, mixing of ortho- and para-Ps states, R(H)-parameter, Ps contactdensity; 6) diffusion-controlled reactions involving Ps (oxidation and ortho-para conversion) at nanosecond stage, temperature dependence of the reaction rate constants.

• Periodical: Solid State Phenomena (Volume 373)
• Pages: 121-143
• DOI: https://doi.org/10.4028/p-T8nEwO
• Online since: July 2025
• Authors: Sergey V. Stepanov*, Liliya I. Budaeva, Olga V. Ilyukhina
• Keywords: Contact Density, Dissolved Oxygen, Energy Losses, Ortho-Para Conversion, Pick-Off Annihilation, Positronium Formation, Ps Bubble Model, Track Structure

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