arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1002.3125physics.atom-ph
收藏

正电子与负离子结合的多体理论计算

Many-body theory calculations of positron binding to negative ions

J. A. Ludlow, G. F. Gribakin

摘要:

作者[Phys.Rev.A70,032720(2004)]发展的多体理论方法被应用于原子系统中的正电子束缚态和湮灭率。在形式体系中,通过求和电子-正电子梯形图系列来充分考虑虚正电子偶素(Ps)的形成,从而使理论能够包括正电子问题中所有重要的多体关联效应。正电子与氢和卤素负离子的束缚态进行了数值计算,也被称为Ps氢化物和Ps卤化物。得到了PsH、PsF、PsCl、PsBr和PsI的Ps结合能分别为1.118、2.718、2.245、1.873和1.393 eV,湮灭速率分别为2.544、2.482、1.984、1.913和1.809 ns $^{-1}$。

英文摘要:

A many-body theory approach developed by the authors [Phys. Rev. A 70, 032720 (2004)] is applied to positron bound states and annihilation rates in atomic systems. Within the formalism, full account of virtual positronium (Ps) formation is made by summing the electron-positron ladder diagram series, thus enabling the theory to include all important many-body correlation effects in the positron problem. Numerical calculations have been performed for positron bound states with the hydrogen and halogen negative ions, also known as Ps hydride and Ps halides. The Ps binding energies of 1.118, 2.718, 2.245, 1.873 and 1.393 eV and annihilation rates of 2.544, 2.482, 1.984, 1.913 and 1.809 ns$^{-1}$, have been obtained for PsH, PsF, PsCl, PsBr and PsI, respectively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑