2016/02/17 by Zhihong Luo, Xiaolin Chen, Jiaming Li +1 · 4 citations
Physics and Astronomy · #Advanced Chemical Physics Studies #Atomic and Molecular Physics #X-ray Spectroscopy and Fluorescence Analysis
paper · doi:10.1103/physreva.93.020501
openalex publication_date 2016/02/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Due to the low cross section of p-wave threshold photodetachment and the complicated electronic structures, the uncertainty of electron affinities for many transition elements still remains around 10 meV, which has not been improved for three decades. In this study, the electron affinity of Nb is measured as 917.40(6) meV or 7399.35(50)\phantom\rule0.28em0excm^\ensuremath-1 using the slow electron velocity imaging method. The accuracy was improved by a factor of more than 400 with respect to the previous measurement. Furthermore, the fine structures of Nb^\ensuremath- were successfully resolved: 16.87(12) meV (5D1), 46.75(12) meV (5D2), 86.85(12) meV (5D3), and 156.00(37) meV (5D4) above the ground 5D0, respectively.