Angular Correlation of Positron Annihilation Radiation in Chromium and Molybdenum
Angular Correlation of Positron Annihilation Radiation in Chromium and Molybdenum
复制标题
铬和钼中正电子湮灭辐射的角度相关性
DOI：
10.1143/jpsj.43.1229
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发表时间：
1977
影响因子：
1.7
通讯作者：
Y. Kubo
中科院分区：
文献类型：
--
作者：
N. Shiotani;T. Okada;H. Sekizawa;S. Wakoh;Y. Kubo
测量了Cr和Mo中正电子湮没辐射的角关联。采用态相关势的APW方法对Mo的能带结构进行了自洽计算。用APW方法计算了Cr和Mo的理论角关联。所观察到的精细结构的角度相关性和结晶各向异性很好地再现了计算。然而，当理论和实验相关曲线归一化为等面积时，理论曲线在小角度区域的计数率始终低于实验曲线，而在大角度区域的计数率则高于实验曲线。这种理论和实验之间的差异与我们以前在V和Nb中发现的相同，并且归因于电子-正电子相关效应。
Angular correlation of positron annihilation radiation in Cr and Mo were measured. Self-consistent band structure calculations for Mo were carried out by the APW method with state-dependent potentials. Theoretical angular correlations for Cr and Mo were also calculated by the APW method. Observed fine structures on the angular correlations and the crystalline anisotropies were well reproduced by the calculations. However, when the theoretical and experimental correlation curves were normalized to an equal area, the theoretical curves were consistently lower in counting rate than the experimental ones in small angle region, and higher in large angle region. This type of discrepancy between the theory and the experiment is the same as we previously found in V and Nb, and is ascribed to the electron-positron correlation effects.