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- W2064755896 abstract "The diffusion trapping model has been applied to slow positron annihilation in He+ irradiated polystyrene and polystyrene – polystyrene bilayers. The S-parameter and the positron lifetime have been calculated as a function of the incident positron energy. The effect of the fluence upon the nature of the S-parameter curve has been discussed. It has been found that a change in fluence affects positronium formation. The transition rate for surface to positronium formation has been found to be dependent upon the fluence and the atomic number of the irradiated ion. The lifetime results show that, at low energy, the o-Ps annihilates mainly at the polymeric surface. The free volume hole concentration is found to decrease at low energy, and becomes constant at higher energies." @default.
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- W2064755896 date "2010-12-01" @default.
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- W2064755896 title "Slow Positron Studies in Polymers" @default.
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- W2064755896 doi "https://doi.org/10.4028/www.scientific.net/ddf.307.85" @default.
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