Angular Distribution of Positron Annihilation Radiation in Vanadium and Niobium–Theory
Angular Distribution of Positron Annihilation Radiation in Vanadium and Niobium–Theory
复制标题
钒和铌中正电子湮灭辐射的角分布——理论
DOI：
10.1143/jpsj.38.416
复制
发表时间：
1975
影响因子：
1.7
通讯作者：
J. Yamashita
中科院分区：
文献类型：
--
作者：
S. Wakoh;Y. Kubo;J. Yamashita
用APW方法计算了钒和铌中双光子正电子湮没过程的角关联曲线。理论与实验的一致性很好，特别是计算很好地再现了实质性的各向异性，尽管在小动量区实验值略高于理论值。得出的结论是，当采用适当的有效单电子势时，APW方法的独立粒子模型可以很好地解释这些过渡金属中的电子分布。它还得出结论，正电子探针似乎没有扰动系统。因此，正电子湮没的实验结果对提供过渡金属的电子结构信息是有用的。
The angular correlation curves due to the two photon positron annihilation process in vanadium and niobium are calculated by APW method. The agreement between theory and experiment is found to be excellent, and especially, the substantial anisotropy is well reproduced by the calculation, although the experimental values are a little higher than the theoretical ones in the region of small momentum. It is concluded that the electronic distribution in these transition metals is well explained by an independent-particle model of APW method when a proper effective one-electron potential is adopted. It is also concluded that positron probes do not seem to perturb the system much. Therefore, the experimental results of the positron annihilation are useful in providing information about electronic structures in transition metals.