SEARCH Articles Figures Tables Annihilate Annihilation Annihilation lifetime Free volume positron annihilation lifetime spectroscopy Lifetime spectroscopy Positron Positron annihilation Positron annihilation lifetime Positron annihilation lifetime spectroscopy Positron annihilation lifetime spectroscopy PALS), free volume Positron annihilation lifetime spectroscopy free volume polymers Positron annihilation lifetime spectroscopy high free volume polymers Positron annihilation lifetime spectroscopy volume holes Positron lifetime spectroscopy Positron lifetimes Positron spectroscopy Spectroscopy, positron annihilation