Gamma-ray spectra from low-energy positron annihilation processes in molecules
Gamma-ray spectra from low-energy positron annihilation processes in molecules
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分子中低能正电子湮灭过程的伽马射线光谱
DOI：
10.1103/physreva.94.052709
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发表时间：
2016
影响因子：
2.9
通讯作者：
Ma XQ
中科院分区：
文献类型：
--
作者：
Ma Xiaoguang;Wang Meishan;Zhu Yinghao;Liu Yang;Yang Chuanlu;Wang Dehua;Ma XQ
本文研究了各种原子和分子中正电子-电子湮灭过程的理论射线谱。系统地研究了这些分子的核心、内层价电子和外层价电子的理论多普勒展宽谱。结果表明，实验能谱与内层价电子，特别是最低占据价轨道电子相吻合，而与外层价电子相吻合。这些内层价电子与相应的实验测量值有很强的相关性。这些发现是有趣的，因为外层价电子被认为比内层价电子有更大的几率与正电子湮灭。本文的工作还表明，在正电子-电子湮灭过程中，必须引入精确的正电子波函数才能清楚地确定束缚电子的主导地位。
The theoretical-ray spectra from positron-electron annihilation process in a wide variety of atoms and molecules are studied. The theoretical Doppler broadened-ray spectra for core, inner valence, and outer valence electrons of these molecules are studied systematically. The present results show that the experimental-ray spectra agree well with inner valence electrons, especially the lowest occupied valence orbital electrons rather than the outer valence electrons. These inner valence electrons show a strong correlation with the corresponding available experimental measurements. These findings are interesting because the outer valence electrons have been supposed to have larger probability annihilating with positrons rather than the inner valence electrons. The present work also suggests that the accurate positron wave functions must be involved to identify the dominance of the bound electrons clearly in positron-electron annihilation process.