Positron annihilation in glycerol in the range 258-423 K: an account for temperature dependent kinetics of the Ps bubble growth as seen in PALS spectra

摘要

Following Ferrel (1957) it is commonly accepted that the final positronium (Ps) state in a liquid is the so-called bubble state. The Ps bubble grows due to an exchange repulsion between the electron in Ps and those in the surrounding molecules. In contrast to the solvated electron, no polarization interaction with environment is involved in the case of Ps because it is electrically neutral. For description of the kinetics of the Ps bubble growth we used the Navier-Stockes equation [1,2]. In glycerol, the estimated time of the bubble formation varies in a very wide range (0.1 ns - 100 ns) in the experimentally studied temperature (T) interval (258 - 423 K).