Accurate Electron Affinity of Iron and Fine Structures of Negative Iron ions.
Accurate Electron Affinity of Iron and Fine Structures of Negative Iron ions.
复制标题
铁的精确电子亲和势和负铁离子的精细结构
DOI：
10.1038/srep24996
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发表时间：
2016-05-03
影响因子：
4.6
通讯作者：
Ning C
中科院分区：
文献类型：
--
作者：
Chen X;Luo Z;Li J;Ning C
电离势(IP)被定义为移除原子中最松散结合的电子所需的能量，而电子亲和势(EA)被定义为电子与中性原子结合时释放的能量。IP和EA对于理解元素的化学性质都是至关重要的。与中性原子的精确激发态和结构相比，负离子的电子活化能谱和结构相对较少被研究，尤其是过渡金属阴离子。在这里，我们报道了用慢电子速度成像法精确测量Fe的Ea值和Fe-−的精细结构。这些测量产生非常精确的Ea值Fe，1235.93(28)cm−1或153.236(34)meV。成功地解决了Fe-−的精细结构问题。本工作为理论计算提供了可靠的基准，也为将其他过渡金属原子的EA测量提高到亚厘米−1的精度铺平了道路。
Ionization potential (IP) is defined as the amount of energy required to remove the most loosely bound electron of an atom, while electron affinity (EA) is defined as the amount of energy released when an electron is attached to a neutral atom. Both IP and EA are critical for understanding chemical properties of an element. In contrast to accurate IPs and structures of neutral atoms, EAs and structures of negative ions are relatively unexplored, especially for the transition metal anions. Here, we report the accurate EA value of Fe and fine structures of Fe−using the slow electron velocity imaging method. These measurements yield a very accurate EA value of Fe, 1235.93(28) cm−1or 153.236(34) meV. The fine structures of Fe−were also successfully resolved. The present work provides a reliable benchmark for theoretical calculations and also paves the way for improving the EA measurements of other transition metal atoms to the sub cm−1accuracy.