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Temperature dependence of the lifetime τ3 and intensity I 3 of the long-lived ortho-positronium (o-Ps) component was measured for two polyimides PI189 and PI304 both below and above glass-transition temperatures Tg of these polymers. First heating runs of the experiments revealed anomalous, irregular behavior of the lifetime τ3 in both PI in the vicinity (below) of the glass transition temperature...
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