Accurate electron affinity of atomic cerium and excited states of its anion

doi:10.1088/1674-1056/ab90e9

Abstract Electron affinities (EA) of most lanthanide elements still remain unknown owing to their relatively lower EA values and the fairly complicated electronic structures. In the present work, we report the high-resolution photoelectron spectra of atomic cerium anion Ce^- using the slow electron velocity-map imaging method in combination with a cold ion trap. The electron affinity of Ce is determined to be 4840.62(21) cm^-1 or 0.600160(26) eV. Moreover, several excited states of Ce^- (⁴H_9/2, ⁴I_9/2, ²H_9/2, ²G_9/2, ²G_7/2, ⁴H_13/2, ²F_5/2, and ⁴I_13/2) are observed.

Keywords: electron affinity cerium anion slow electron velocity-map imaging cold ion trap

Received: 07 April 2020
Revised: 29 April 2020
Accepted manuscript online:

PACS:	32.10.Hq	(Ionization potentials, electron affinities)
	32.80.Gc	(Photodetachment of atomic negative ions)
	37.10.Rs	(Ion cooling)
	37.10.Ty	(Ion trapping)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 91736102 and 11974199) and the National Key R&D Program of China (Grant No. 2018YFA0306504).

Corresponding Authors: Chuan-Gang Ning
E-mail: ningcg@tsinghua.edu.cn

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Xiao-Xi Fu(付筱茜), Ru-Lin Tang(唐如麟), Yu-Zhu Lu(陆禹竹), Chuan-Gang Ning(宁传刚) Accurate electron affinity of atomic cerium and excited states of its anion 2020 Chin. Phys. B 29 073201

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Accurate electron affinity of atomic cerium and excited states of its anion

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