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Influence of the effective electron-positron correlation potential on the calculation of momentum densities of positron annihilation pairs

机译:有效的电子-正电子相关势对正电子hil灭对动量密度计算的影响

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In this work we apply the 2C-DFT (two-component density-functional theory) within the Kohn-Sham scheme and the local density approximation in the limit of small positron densities to the determination of the electron and positron states of one positron in the alkali metals lithium, sodium and potassium. For the representation of the electron and positron crystal wave functions we use a numerical-basis-set LCAO (linear combination of atomic orbitals) expansion. Since the positron is assumed to be in the ground state Gamma (1), psi (+) has the symmetry of the crystal lattice, therefore, we put to use the LSO (localized spherical orbitals) method. As a result we show the influence of the effective electron-positron correlation potential on psi (+) and on the high momentum components of annihilation rates within the IPA (independent particle approximation). [References: 14]
机译:在这项工作中,我们将Kohn-Sham方案内的2C-DFT(两组分密度函数理论)和小正电子密度极限中的局部密度近似应用于确定电子中一个正电子的状态。碱金属锂,钠和钾。对于电子和正电子晶体波函数的表示,我们使用基于数值的集合LCAO(原子轨道的线性组合)展开。由于假定正电子处于基态Gamma(1),所以psi(+)具有晶格的对称性,因此,我们使用LSO(局部球形轨道)方法。结果,我们显示了有效的电子-正电子相关势对psi(+)和IPA内an灭率的高动量分量(独立粒子逼近)的影响。 [参考:14]

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