2025/06/12 by Rui Zhang, Zhang, Rui, Wenru Jie +7 · 1 citation
Biochemistry, Genetics and Molecular Biology · Materials Science · Physics and Astronomy · #Advanced Electron Microscopy Techniques and Applications #Atomic Physics (physics.atom-ph) #Atomic and Molecular Physics #Electron and X-Ray Spectroscopy Techniques #FOS: Physical sciences
paper · pdf · doi:10.48550/arxiv.2506.10300
openalex publication_date 2025/06/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The electron affinity (EA) of atomic selenium, previously established as 16,297.276(9) cm-1 based on the laser photodetachment microscopy (LPM) measurements in 2012, exhibited a significant deviation from other earlier experimental values, yet it remained the accepted reference standard for over a decade. In this letter, we re-examined the EA of Se using the slow-electron velocity-map imaging method and revealed a substantial deviation in the LPM result. Measurements for the different isotopes of Se and the energy-level splitting of the neutral Se atom's 3P2 - 3P1 further verified the accuracy and robustness of our SEVI method. Based on these experimental evidences, we recommended a revised EA(Se) value of 16,297.78(4) cm-1, which is in excellent agreement with the previous laser photodetachment threshold (LPT) experimental results.