Positron and Positronium Annihilation in Polymers Studied by Age-Momentum Correlation Spectroscopy

• Authors: K. Sato , H. Murakami , K. Ito , K. Hirata , Y. Kobayashi
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

71.60.+z   78.70.Bj   82.30.Gg   42.70.jk  

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 5
• Pages: 1511-1516

Dates

published

2008-05

received

2007-09-03

References

• 1. For example, Positron Solid State Physics, Eds. W. Brandt, A. Dupasquier, North-Holland, Amsterdam 1983
• 2. Y. Nagai, T. Chiba, Z. Tang, T. Akahane, T. Kanai, M. Hasegawa, M. Takenaka, E. Kuramoto, Phys. Rev. Lett. 87, 176402 (2001)
• 3. K. Sato, K. Ito, K. Hirata, R.S. Yu, Y. Kobayashi, Phys. Rev. B 71, 012201 (2005)
• 4. K. Sato, D. Shanai, Y. Hotani, T. Ougizawa, K. Ito, K. Hirata, Y. Kobayashi, Phys. Rev. Lett. 96, 228302 (2006)
• 5. K. Ito, Y. Kobayashi, A. Nanasawa, Appl. Phys. Lett. 82, 654 (2003)
• 6. C.L. Wang, T. Hirade, F.H.J. Maurer, M. Eldrup, N.J. Pedersen, J. Chem. Phys. 108, 4654 (1998)
• 7. A. Uedono, T. Kawano, S. Tanigawa, M. Ban, M. Kyoto, Nucl. Instrum. Methods Phys. Res. B 103, 511 (1995)
• 8. H. Stoll, M. Koch, U. Lauff, K. Maier, J. Major, H. Schneider, A. Seeger, A. Siegle, Appl. Surf. Sci. 85, 17 (1995)
• 9. N. Suzuki, T. Hirade, F. Saito, T. Hyodo, Radiat. Phys. Chem. 68, 647 (2003)
• 10. C. Dauwe, B. Van Waeyenberge, N. Balcaen, Phys. Rev. B 68, 132202 (2003)
• 11. Y. Kobayashi, C.L. Wang, K. Hirata, W. Zheng, C. Zhang, Phys. Rev. B 58, 5384 (1998)
• 12. Y. Nagai, T. Nonaka, M. Hasegawa, Y. Kobayashi, C.L. Wang, W. Zheng, C. Zhang, Phys. Rev. B 60, 11863 (1999)

Identifiers

DOI

10.12693/APhysPolA.113.1511