固体中电子-正电子动量密度随态增强的实验测定
Experimental determination of the state-dependent enhancement of the electron-positron momentum density in solids
摘要：
本文研究了一些过渡金属和简单金属（Cr，V，Ag和Al）的电子-正电子动量密度增强的状态依赖性。与线性化的松饼-锡轨道计算的相应数量在第一布里渊区的定量比较示出产生的S，P和D状态的增强的测量，独立于任何参数化的电子密度本地的正电子。一个经验修正，可以应用到第一原理的状态依赖模型，提出了再现测量的状态依赖性非常好，产生一个一般的，预测模型的增强的动量分布的正电子湮没测量，包括角相关和符合多普勒展宽技术。
英文摘要：
The state-dependence of the enhancement of the electron-positron momentum density is investigated for some transition and simple metals (Cr, V, Ag and Al). Quantitative comparison with linearized muffin-tin orbital calculations of the corresponding quantity in the first Brillouin zone is shown to yield a measurement of the enhancement of the s, p and d states, independent of any parameterizations in terms of the electron density local to the positron. An empirical correction that can be applied to a first-principles state-dependent model is proposed that reproduces the measured state-dependence very well, yielding a general, predictive model for the enhancement of the momentum distribution of positron annihilation measurements, including those of angular correlation and coincidence Doppler broadening techniques.
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