Concepts, Methods and Applications of Quantum Systems in Chemistry and Physics - Selected proceedings of QSCP-XXI (Vancouver, BC, Canada, July 2016)
Concepts, Methods and Applications of Quantum Systems in Chemistry and Physics - Selected proceedings of QSCP-XXI (Vancouver, BC, Canada, July 2016)
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化学和物理中量子系统的概念、方法和应用 - QSCP-XXI 论文集精选（加拿大不列颠哥伦比亚省温哥华，2016 年 7 月）
DOI：
10.1007/978-3-319-74582-4_14
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Green D
中科院分区：
文献类型：
--
作者：
Green D
用多体理论计算了动量达正电子形成阈值的S、p波和d波正电子在稀有气体原子价电子和核电子上湮没的动量密度和顶点增强因子。增强因子将短程电子-正电子关联的影响参数化，从而使湮没几率超过独立粒子近似。对于所有正电子分波和电子亚壳层，增强因子对正电子动量相对不敏感。核心电子轨道的增强因子也几乎与正电子角动量无关。最大的增强因子()是在Xe中的5p轨道，而核心轨道的值通常是。
Annihilation momentum densities and vertex enhancement factors for positron annihilation on valence and core electrons of noble-gas atoms are calculated using many-body theory for s, p and d-wave positrons of momenta up to the positronium-formation threshold. The enhancement factors parametrize the effects of short-range electron-positron correlations which increase the annihilation probability beyond the independent-particle approximation. For all positron partial waves and electron subshells, the enhancement factors are found to be relatively insensitive to the positron momentum. The enhancement factors for the core electron orbitals are also almost independent of the positron angular momentum. The largest enhancement factor () is found for the 5p orbital in Xe, while the values for the core orbitals are typically.