Role of Trapped and Solvated Electrons in Ps Formation

• Authors: S. Stepanov , V. Byakov , C. He , T. Hirade , K. Mikhin
• Languages of publication: EN

Abstracts

EN

Role of trapped and solvated electrons in Ps formation is discussed. Combination of thermalized positron with such electrons is possible from the viewpoint of the energy balance and may results in Ps formation. This process proceeds during all e^+ lifetime in matter. Fitting of raw experimental e^+ - e^- annihilation spectra has to be based on an adequate physical input, which often leads to necessity of nonexponential deconvolution of the spectra. We have interpreted the Ps formation data in polyethylene, ethylene-methylmethacrylate and polymethylmethacrylate in dark and in light vs. time of the measurement and temperature. Parameters characterized accumulation of trapped electrons and their recombination with counter ions and positrons are obtained.

Keywords

EN

61.80.Fe; 36.10.Dr; 78.70.Bj; 82.35.Lr

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 82.35.Lr: Physical properties of polymers
• 36.10.Dr: Positronium(see also 82.30.Gg Positronium chemistry)
• 61.80.Fe: Electron and positron radiation effects

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 107
• Issue: 4
• Pages: 642-650

Dates

published

2005-04

received

2004-09-20

Contributors

author

S. Stepanov

• Institute for Theoretical and Experimental Physics, 117218 Moscow, Russia

author

V. Byakov

• Institute for Theoretical and Experimental Physics, 117218 Moscow, Russia

author

C. He

• Photonics Research Institute, AIST, Umezono 1-1-1, Tsukuba, Ibaraki 305-8568, Japan

author

T. Hirade

• Japan Atomic Energy Research Institute, 319-1195 Tokai, Japan

author

K. Mikhin

• Institute for Theoretical and Experimental Physics, 117218 Moscow, Russia

References

• 1. O.E. Mogensen, Positron Annihilation in Chemistry, Springer-Verlag, Berlin 1995
• 2. S.V. Stepanov, V.M. Byakov, in: Principles and Applications of Positron and Positronium Chemistry, Eds. Y.C. Jean, P.E. Mallone, D.M. Schrader, World Scientific Publ., Singapore 2003, p. 117
• 3. V.M. Byakov, V.I. Grafutin, O.V. Koldaeva, Radiat. Phys. Chem., 10, 239, 19
• 4. T. Hirade, F.H.J. Maurer, M. Eldrup, Radiat. Phys. Chem., 58, 465, 2000
• 5. C. He, T. Suzuki, V.P. Shantarovich, L. Ma, M. Matsuo, K. Kondo, Y. Ito, Phys. Lett. A, 313, 223, 2003
• 6. T. Hirade, Radiat. Phys. Chem., 68, 375, 2003
• 7. N. Suzuki, T. Hirade, F. Saito, T. Hyodo, Radiat. Phys. Chem., 68, 647, 2003
• 8. T. Suzuki, C. He, V. Shantarovich, K. Kondo, E. Hamada, M. Matsuo, L. Ma, Y. Ito, Radiat. Phys. Chem., 66, 161, 2003
• 9. C. He, T. Suzuki, L. Ma, M. Matsuo, V.P. Shantarovich, K. Kondo, Y. Ito, Phys. Lett. A, 304, 49, 2002
• 10. Dauwe, B. Van Waeyenberge, N. Balcaen, Phys. Rev. B, 68, 132202, 2003
• 11. Ito, T. Suzuki, Radiat. Phys. Chem., 66, 343, 2003

Identifiers

DOI

10.12693/APhysPolA.107.642