正电子与电子相遇后一起消失而放出光子的过程。正电子是电子的反粒子,它的质量和电荷量与电子相同,但电荷符号相反。1929 年P.A.M.狄拉克预言了正电子的存在,1932 年C.D.安德森用云室研究宇宙射线时发现了正电子。中国物理学家赵忠尧在此之前(1929~1930)曾观测到重元素对硬γ射线有反常的吸收,并伴随放出能量大约为5.50×105 电子伏的光子,后来被证实为正、负电子对的产生和随后正电子的湮没辐射。
借助慢正电子湮没技术研究了样品的空位型缺陷。
The vacancy defects of samples were measured by slow positron annihilation.
应用正电子湮没寿命谱研究了十二种典型镍镀层的结构缺陷。
Nickel, electrodeposited from twelve typical plating baths, were investigated by positron annihilation lifetime spectroscopy.
在室温条件下测量了吸收光谱与正电子湮没辐射多普勒展宽谱。
Optical absorption spectra and positron annihilation radiation Doppler broadening were measured at room temperature.
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