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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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.