Positron and Positronium Annihilation in Polymers Studied by Age-Momentum Correlation Spectroscopy
K. Sato a, H. Murakami a, K. Ito b, K. Hirata b and Y. Kobayashi b
a Department of Environmental Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan
b National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
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Received: 3 09 2007;
Positron (e+) and positronium (Ps) annihilation processes in polymers are studied by positron age-momentum correlation spectroscopy, which can sensitively probe momentum distributions of e+, p-Ps, and o-Ps. For polyether sulfone and ethylene tetrafluoroethylene copolymer belonging to oxygen-containing polymers (O group) and fluorine-containing polymers (F group), respectively, significant effects of positron trapping by polar element are observed. The Doppler profile of o-Ps pick-off annihilation is strongly influenced by F atoms, giving rise to anomalous broadening. The results are discussed together with our previous data of the S-I3 correlation in order to explore the feasibility of chemical analysis around the free volumes by age-momentum correlation spectroscopy.
DOI: 10.12693/APhysPolA.113.1511
PACS numbers: 71.60.+z, 78.70.Bj, 82.30.Gg, 42.70.jk