High-resolution determination of the electron affinity of fluorine and bromine using crossed ion and laser beams

1989/10/01 by Christophe Blondel, P. Cacciani, C. Delsart +1 · 4 citations
Physics and Astronomy · Chemistry · #Atomic and Molecular Physics #Laser-Matter Interactions and Applications #Mass Spectrometry Techniques and Applications #Hyperfine structure #Ground state #Atomic physics #Bromine #Ion #Physics #Fluorine #Electron #Materials science #Nuclear physics

paper · doi:10.1103/physreva.40.3698

openalex publication_date 1989/10/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We report tunable-laser photodetachment of F^\mathrm\ensuremath- and Br^\mathrm\ensuremath- ions near the first threshold corresponding to the atomic ²P_3/2 ground state. Using a high-resolution pulsed uv laser calibrated with molecular iodine absorption and doubly crossed laser and ion beam technique, we determine the electron affinities of fluorine and bromine with high accuracy. These determinations account for the hyperfine structure of the atomic ground states of ¹⁹F and ⁷⁹Br,⁸¹Br. The threshold values obtained for the transition between the ion ground state ¹S₀ and the atomic ground hyperfine state ²P_3/2 are 27 432.440(25) cm^\mathrm\ensuremath-1 or 3.401 190(4) eV for fluorine and 27 129.170(15) cm^\mathrm\ensuremath-1 or 3.363 590(3) eV for bromine, and the isotope shift of Br^\mathrm\ensuremath-, ⁷⁹Br is found to be below our experimental resolution.

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