Positron annihilation studies of ageing
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Davis, William J.; Pethrick, Richard A.
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Article
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1998
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John Wiley and Sons
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English
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Structural relaxation processes are reported in polystyrene as a function of ageing time using positron annihilation lifetime and Doppler broadening spectroscopy. Changes in the intensity, lifetimes and line shapes with increasing temperature for ortho positronium annihilation show an internal consi