The Observation of Positron Surface State of Germanium

GUO Xue-Zhe; WENG Hui-Min; HAN Rong-Dian

Chinese Physics C> 1992, Vol. 16> Issue(11) : 961-964

The Observation of Positron Surface State of Germanium

Departement of Modern Physics,University of Scicnce and Technology of China,Hefei 230026

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Abstract：
The formation yield of positronium (Ps) as a function of target temperature has been measured when positron implanting energy was 20eV.By thermal dynamic analyising we obtained the binding energy E_b of positron surface state of germanium to be 2.2eV and the thermal activation energy E_a of Ps to be 0.2±0.01eV at vacuum 1.33×10^－4Pa.The different of E_b and E_a at the condition of high and ultra-high vacuum was discussed.

References

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L. Madanshy and F- Rasetti, iPhys/i. iRev/i., 79 (1950), 397.[2] R. M. J. Cotterill, L. K. Mackenzie, L. Smedskjaer, G. Trumpy and J. H. O. L. Traff, Nautre,239 (1972), 101[3] C. H. Hodgea and M.J. Stott, Solid State Conimwn., 12 (1973), 1153.[4] R. Nieminen and M. Manninen, Solid Stote Comniwn:, 15 (1974), 403.[5] K. F. Canter, A. P. Mills, Jr. and S. Berko, iPhys/i. iRev/i. iLett/i, 33 (1974), 7.[6] A. P. Mills, Jr., Solid State Commun，31 (1979), 623.[7] S. Chu, A.P. Mills, Jr., and A. Nurray, iPhys/i. iRev/i., B23 (1981), 2060.[8] 韩荣典郭学哲翁惠民石星军谢力，物理学报，40(1991)，205.[9] Mills, A. P., Jr and Loren Pfeiffer., iPhys/i. iRev/i. B32 (1985); 53.

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GUO Xue-Zhe, WENG Hui-Min and HAN Rong-Dian. The Observation of Positron Surface State of Germanium[J]. Chinese Physics C, 1992, 16(11): 961-964.

GUO Xue-Zhe, WENG Hui-Min and HAN Rong-Dian. The Observation of Positron Surface State of Germanium[J]. Chinese Physics C, 1992, 16(11): 961-964. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

The Observation of Positron Surface State of Germanium

Corresponding author: GUO Xue-Zhe,

Departement of Modern Physics,University of Scicnce and Technology of China,Hefei 230026

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1992-11-05

Abstract: The formation yield of positronium (Ps) as a function of target temperature has been measured when positron implanting energy was 20eV.By thermal dynamic analyising we obtained the binding energy E_b of positron surface state of germanium to be 2.2eV and the thermal activation energy E_a of Ps to be 0.2±0.01eV at vacuum 1.33×10^－4Pa.The different of E_b and E_a at the condition of high and ultra-high vacuum was discussed.