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首页> 外文期刊>Physica, B. Condensed Matter >Elementally specific electron-positron annihilation radiation emitted from ion cores of group-V impurity-vacancy complexes in germanium
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Elementally specific electron-positron annihilation radiation emitted from ion cores of group-V impurity-vacancy complexes in germanium

机译:从锗的V组杂质-空位络合物的离子核发出的元素比电子正电子an灭辐射

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摘要

High-momentum component (HMC) of the electron-positron annihilation has been detected by the angular correlation of annihilation radiation (ACAR) technique in order to obtain elementally specific information about the ion cores of the donor-vacancy complexes (DV) formed by irradiation with Co-60 gamma-rays at T-irr. approximate to 280 K in oxygen-lean n-Ge doped with group-V donors (D = As, Sb, and Bi). The probability of annihilation of positrons with the core electrons of DV complexes reconstructed from ACAR spectra increases in passing from AsV to SbV and BiV complexes. This increase correlates with the shift of the D atom from its regular position towards the vacancy site predicted by the results of spin-density functional modeling study. The data obtained suggest inward relaxation of the ion cores of DV complexes (including the one directed inward towards the vacancy). (c) 2007 Elsevier B.V. All rights reserved.
机译:电子an灭的高动量成分(HMC)已通过an灭辐射(ACAR)的角度相关技术进行了检测,以便获得有关通过辐射形成的供体-空位配合物(DV)离子核的元素特定信息在T-irr处使用Co-60伽马射线。在掺有V组供体的贫氧n-Ge中,大约280 K(D = As,Sb和Bi)。从ACAR光谱重建的DV配合物的核心电子使正电子ni灭的可能性随着从AsV到SbV和BiV配合物的传递而增加。这种增加与D原子从其正常位置向空位的移动有关,该旋转是通过自旋密度泛函模型研究的结果预测的。获得的数据表明DV复合物的离子核向内松弛(包括一个指向空位的离子核)。 (c)2007 Elsevier B.V.保留所有权利。

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