Positron-Electron Annihilation Process in (2,2)-Difluoropropane Molecule
Positron-Electron Annihilation Process in (2,2)-Difluoropropane Molecule
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(2,2)-二氟丙烷分子中的正电子湮灭过程
DOI：
10.1088/0253-6102/65/4/531
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发表时间：
2016
影响因子：
3.1
通讯作者：
Zhu, Ying-Hao
中科院分区：
文献类型：
--
作者：
Liu, Yang;Ma, Xiao-Guang;Zhu, Ying-Hao
采用量子化学方法研究了(2,2)-二氟丙烷分子中正电子-电子湮灭过程及相应的伽马射线谱。首次发现(2,2)-二氟丙烷分子中的亲正电子。理论预测表明，氟原子最外层2s电子在(2,2)-二氟丙烷的正电子-电子湮灭过程中发挥着重要作用。本方案中理论伽马能谱与实验的相关系数可达99%。本研究给出了较大分子中正电子-电子对的另一种湮灭模型。
The positron-electron annihilation process in (2,2)-difluoropropane molecule and the corresponding gamma-ray spectra are studied by quantum chemistry method. The positrophilic electrons in (2,2)-difluoropropane molecule are found for the first time. The theoretical predictions show that the outermost 2s electrons of fluoride atoms play an important role in positron-electron annihilation process of (2,2)-difiuoropropane. In the present scheme, the correlation coefficient between the theoretical gamma-ray spectra and the experiments can be 99%. The present study gives an alternative annihilation model for positron-electron pair in larger molecules.