Comparisons of Positron and Electron Binding to Molecules
Comparisons of Positron and Electron Binding to Molecules
复制标题
DOI：
10.1103/physrevlett.109.113201
复制
发表时间：
2012-09-13
影响因子：
8.6
通讯作者：
Surko, C. M.
中科院分区：
文献类型：
--
作者：
Danielson, J. R.;Jones, A. C. L.;Surko, C. M.
将正电子与分子的结合与类似的电子-分子结合态进行比较。对于这两种情况，束缚轻子密度都是弥散的，并且保持在价层之外。由于两种效应，正电子结合能比负离子的结合能大一到两个数量级：分子偶极矩的取向允许正电子更接近它，对于正电子，轻子关联(例如，通过偶极极化)贡献更大。
Positron binding to molecules is compared to the analogous electron-molecule bound states. For both, the bound lepton density is diffuse and remains outside the valence shell. Positron binding energies are found to be one to two orders of magnitude larger than those of the negative ions due to two effects: the orientation of the molecular dipole moment allows the positron to approach it more closely and, for positrons, lepton correlations (e.g., via dipole polarizability) contribute more strongly.