A PHENOMENOLOGICAL MODEL FOR POSITRON TRAPPING AT DISLOCATIONS

XIONG Liang-Yue

Chinese Physics C> 1988, Vol. 12> Issue(4) : 433-439

A PHENOMENOLOGICAL MODEL FOR POSITRON TRAPPING AT DISLOCATIONS

XIONG Liang-Yue ^,

Institute of Metal Research,Academia Sinica,Shenyang

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A multi-state trapping model involving positron trapping at dislocations and jogs is proposed,in which the effect of positron detrapping can be omitted.According to this model the dislocations with variant jog density have different functions in positron Annihilation process.The case that dislocation trapping is predominant and the open-space ratio between dislocation core and single-vacancy were emphatically discussed.Using the data in some literature we have estimated the positron annihilated rate at dislocations and the jog interval on the dislocation line.The results obtained seems reasonable.

References

[1]

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[14]	XIONG Liang-Yue , LONG Qi-Wei . POSITRON DISLOCATION TRAPPING MODEL INCLUDING THE EFFECTS OF DETRAPPING OF POSITRON FROM DISLOCATIONS. Chinese Physics C, 1990, 14(9): 769-776.
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[16]	SHEN Ji-Qiang , LONG Qi-Wei , ZHOU Jin , WANG Ke-Lin . ATOMIC DENSITY DISTRIBUTIONS OF GRAIN BOUNDARIES IN METALS AND CHARACTERISTICS OF POSITRON ANNIHILATION LIFETIME SPECTRA. Chinese Physics C, 1989, 13(10): 879-885.
[17]	XIONG Liang-Yue(L.Y.Xiong) . THE ACCURATE DETERMINATION OF SMALL VARIATIONS FOR THE PARAMETERS OF POSITRON LIFETIME SPECTRA IN AMORPHOUS ALLOY. Chinese Physics C, 1986, 10(5): 513-518.
[18]	XIONG Xing-Min . A STUDY OF DEFECTS DEFECTS IN GaAs BY POSITRON ANNIHILATION. Chinese Physics C, 1986, 10(4): 459-465.
[19]	XIE Jia-Lin . ON THE AVERAGE LUMINOSITY OF ELECTRON POSITRON COLLIDER AND POSITRON-PRODUING ENERGY. Chinese Physics C, 1985, 9(5): 577-585.
[20]	WANG Shu-Ying . METHOD OF ANALYSING POSITRON ANNIHILATION LIFETIME SPECTRUM WITH A MULTI EXPONENTIAL CURVE FITTING. Chinese Physics C, 1983, 7(4): 408-414.

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XIONG Liang-Yue. A PHENOMENOLOGICAL MODEL FOR POSITRON TRAPPING AT DISLOCATIONS[J]. Chinese Physics C, 1988, 12(4): 433-439.

XIONG Liang-Yue. A PHENOMENOLOGICAL MODEL FOR POSITRON TRAPPING AT DISLOCATIONS[J]. Chinese Physics C, 1988, 12(4): 433-439. 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

A PHENOMENOLOGICAL MODEL FOR POSITRON TRAPPING AT DISLOCATIONS

Corresponding author: XIONG Liang-Yue,

Institute of Metal Research,Academia Sinica,Shenyang

Received Date: 1900-01-01

Accepted Date: 1900-01-01

Available Online: 1988-08-05

Abstract: A multi-state trapping model involving positron trapping at dislocations and jogs is proposed,in which the effect of positron detrapping can be omitted.According to this model the dislocations with variant jog density have different functions in positron Annihilation process.The case that dislocation trapping is predominant and the open-space ratio between dislocation core and single-vacancy were emphatically discussed.Using the data in some literature we have estimated the positron annihilated rate at dislocations and the jog interval on the dislocation line.The results obtained seems reasonable.

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A PHENOMENOLOGICAL MODEL FOR POSITRON TRAPPING AT DISLOCATIONS

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