1999/12/10 by R. C. Bilodeau, M. Scheer, H. K. Haugen +1 · 2 citations
Physics and Astronomy · #Advanced Chemical Physics Studies #Spectroscopy and Quantum Chemical Studies #Laser-Matter Interactions and Applications #Physics #Atomic physics #Electron affinity (data page) #Energy (signal processing) #Electron #Ion #Spectroscopy #Quantum mechanics #Molecule
paper · doi:10.1103/physreva.61.012505
openalex publication_date 1999/12/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The electron affinity of Ir is measured to be 12617.4(12) cm^\mathrm\ensuremath-1\phantom\rule0ex0ex[1.56436(15)eV], from photodetachment studies on Ir^\mathrm\ensuremath-. Previous measurements of the electron affinity of platinum reported results which were inconsistent within quoted error bars. A photodetachment study with a very improved energy resolution, signal-to-noise ratio, and signal-to-background ratio, was conducted on Pt^\mathrm\ensuremath-, and yields a much more accurate electron affinity for Pt of 17140.1(4) cm^\mathrm\ensuremath-1 [2.12510(5)eV], in good agreement with the most recent measurement. Possible explanations for the poor agreement between the earlier results are discussed. In both the Ir^\mathrm\ensuremath- and Pt^\mathrm\ensuremath- spectra, the data indicate that the detachment cross section deviates from the expected Wigner threshold law, even near the detachment threshold. This behavior cannot be explained by the correction terms to the Wigner law proposed by the currently available threshold detachment models.