Effect of an external electric field on the positronium formation in the positron spur

Characterization of the free volume in high‐impact polystyrene/polypropylene and high‐impact polystyrene/high‐density polyethylene blends probed by positron annihilation spectroscopy

“…The increase in the dielectric constant indicated the formation of interfacial polarization in the regions between the two amorphous phases. The inference about the influence of the interfacial polarization on measured I 3 was also supported by an earlier experiment of Mogensen 19 and our other experiments, 12 where it was found that variations of the measured I 3 had a good relationship with the dielectric constants of polymers.…”

External electric field effect on positronium formation in some polar and nonpolar polymers at different temperatures

“…According to the recombination mechanism [14,15], when incident positron energy becomes less than about 500 eV, the terminal positron spur (recently also called ''blob'' which we are using here) is formed. Some positrons will stop inside the blob together with several tens of ionexcess electron pairs, while some others can move out of the blob.…”

A study on free volume of acrylonitrile-styrene copolymer and methyl methacrylate-styrene copolymer by using positron annihilation

“…10,11 The o-Ps intensity I 3 is equal to 3P/4, where P is the Ps formation probability, provided Ps is not involved in chemical reactions before the annihilation. 12 In the spur model proposed by Mogensen,13 it is assumed that positronium (Ps) is formed as a result of a spur reaction between the positron and a spur electron in the positron spur. Ps formation must compete with electron-ion recombination, with any electron and positron reactions with solvent molecules or scavengers, and with electron and positron diffusion out of the spur.…”