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Abstract
The enhancement of the positronium (Ps) formation in polyethylene on the application of an electric field above 0.35 MV cm -1, measured by Bisi et al., is discussed in terms of the spur model of Ps formation. Apparently, two effects can explain the results, namely (1) Ps formation by positron reaction with electrons injected in the charging processes at a high field, and (2) field dependent thermionic emission of excess electrons and positron trapped in the positron spur. The Ps enhancement in high fields does not disprove the spur model, even if the heating up of the positrons in high fields is assumed to take place.
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