Reactions of hot electrons and positrons

Despite the inefficiency of the Ore mechanism in the condensed phase discussed above, reactions of sub-ionizing electrons and the positron during the slowing-down process cannot be ignored because of the possibility of 

If e is weakly bound in S, an additional reaction leading to Ps formation becomes possible  

The fraction, pe, of the electrons escaping resonance capture by S (cs the concentration of the solute) depends on the energy spectrum, /(Wo), of sub-ionizing electrons and stopping power, dW/dx vib (Problem 5) [29]  

When Pg- and the polarization part of VJ, approximately cancel each other, Eq. (14) is reduced to Wl Wq — AX. Thus, the difference Wq — Wl is determined by zero-point kinetic energy AX of electrons in the medium. For example, when S has a maximum of crG(W) close to the thermal region, in the liquid phase it even may lose trapping ability, i.e., WG - AX 0, because of a lack of electrons with small energies (AX is the lowest possible kinetic energy of the quasi-free electrons in a liquid). 

If tg(E) has the simplest form cro6(W — Wg), from Eq. (13) we easily obtain  

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