Electron affinity of atomic scandium and yttrium and excited states of their negative ions
Electron affinity of atomic scandium and yttrium and excited states of their negative ions
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DOI：
10.1063/5.0124882
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Chuangang Ning
中科院分区：
文献类型：
--
作者：
Rui Zhang;Yuzhu Lu;Rulin Tang;Chuangang Ning
The latest experimental electron affinity (EA) values of atomic Scandium and Yttrium were 0.189(20) eV and 0.308(12) eV reported by Feigerle et al. in 1981. The measurement accuracy was far lower than that for other transition elements, and no conclusive result had been made on the excited states of their negative ions. In the current work, we report more accurate EA values of Sc and Y as well as the electronic structure of their negative ions using the slow-electron velocity-map imaging (SEVI) method. The EA values of Sc and Y are determined to be 0.179 378(22) eV and 0.311 29(22) eV, respectively. The EA values of Sc and Y are determined to be 0.179 378(22) eV and 0.311 29(22) eV, respectively. The ground state of Sc− is identified as 3 d4 s24 p 1 D2, and 4 d5 s25 p 1 D2 for Y-. Moreover, several excited states of Sc- and Y- are observed: Sc- (3 D1) and Y- (3 D1, 3 D2, 3 D3, 3 F2, and 3 F3), and their energy levels are determined to be 1 131.8(28), 1 210.0(13), 1 362.3(30), 1 467.7(26), 1 747(16), and 1 987(33) cm-1, respectively.
