SEARCH Articles Figures Tables Annihilate Annihilation Annihilation lifetime Lifetime spectroscopy PAL PALS (positron annihilation lifetime Positron Positron annihilation Positron annihilation lifetime Positron annihilation lifetime spectroscopy Positron annihilation lifetime spectroscopy PALS), free volume Positron annihilation lifetime spectroscopy PALS), polymer transport properties Positron annihilation spectroscopy (PALS Positron lifetime spectroscopy Positron lifetimes Positron spectroscopy Spectroscopy, positron annihilation