Many-body theory applied to negative ions
Many-body theory applied to negative ions
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多体理论应用于负离子
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
S. Blundell
中科院分区：
文献类型：
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作者：
W. Johnson;J. Sapirstein;S. Blundell
在闭壳外具有一个电子的负离子中价电子的准粒子轨道由戴森方程确定。作者用二阶多体微扰理论导出的近似值代替了戴森方程中的固有自能。求解负钯离子 4d105s 状态的所得方程，得到电子亲和力值为 0.525 eV，而测量值为 0.558+or-0.008 eV；对于钙负离子的 4s24p 态，作者获得的亲和力为 0.056 eV，而测量值为 0.043+or-0.007 eV；对于锶负离子，作者预测 5s25p 态的亲和力为 0.093 eV；对于钡负离子，他们预测 6s26p 态的亲和力为 0.192 eV。
The quasiparticle orbital for the valence electron in a negative ion having one electron outside closed shells is determined from the Dyson equation. The authors replace the proper self-energy in the Dyson equation by an approximation derived from second-order many-body perturbation theory. Solving the resulting equation for the 4d105s state of the negative palladium ion they obtain a value of 0.525 eV for the electron affinity, compared with the measured value 0.558+or-0.008 eV; for the 4s24p state of the calcium negative ion the authors obtain an affinity 0.056 eV, compared with the measured value 0.043+or-0.007 eV; for the strontium negative ion the authors predict a 5s25p state having an affinity 0.093 eV; and for the barium negative ion they predict a 6s26p state with affinity 0.192 eV.