arXiv 1608.047782016-08-16physics.atom-ph

镧系元素中负离子的形成：多体效应

Negative ion formation in lanthanide atoms: Many-body effects

Z. Felfli, A. Z. Msezane, D. Sokolovski

备注：: 18 pages, 6 figures, 1 table

摘要：

对镧系元素Eu、Nd、Tb、Tm的低能电子散射的研究表明，电子关联效应和核极化是负离子形成亚稳态的主要基本多体效应。Ramsauer Townsend极小值，形状共振和结合能的所得阴离子的识别和提取的弹性总截面计算使用复数角动量方法。最近测得的电子亲合势为0.116和以前测得的值为1.053 eV的Eu之间的巨大差异得到解决。此外，先前测量的Nd，Tb和Tm的电子亲合性被调和，并从计算的总截面中提取新的值。这里发现的这些原子的大电子亲和力，应该是有用的负离子纳米催化，包括甲烷转化为甲醇没有二氧化碳排放，具有显着的环境影响。强大的复角动量方法只需要几个极点，在没有实验或其他理论数据的先验知识的情况下，可以得到负离子亚稳态的可靠结合能，并且应该适用于其他复杂系统，以便从根本上理解它们之间的相互作用。

英文摘要：

Investigations of low-energy electron-scattering of the lanthanide atoms Eu, Nd, Tb, Tm demonstrate that electron-correlation effects and core polarization are the dominant fundamental many-body effects responsible for the formation of metastable states of negative ions. Ramsauer Townsend minima, shape resonances and binding energies of the resultant anions are identified and extracted from the elastic total cross sections calculated using the complex angular momentum method. The large discrepancy between the recently measured electron affinity of 0.116 and the previously measured value of 1.053 eV for Eu is resolved. Also, the previously measured electron affinities for Nd, Tb and Tm are reconciled and new values are extracted from the calculated total cross sections. The large electron affinities found here for these atoms, should be useful in negative ion nanocatalysis, including methane conversion to methanol without CO2 emission, with significant environmental impact.. The powerful complex angular momentum method which requires only a few poles, yields reliable binding energies for the metastable states of negative ions with no a priori knowledge of experimental or other theoretical data and should be applicable to other complex systems for the fundamental understanding of their interactions.

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