Electron affinity of thallium measured with threshold spectroscopy

2020/05/21 by C. W. Walter, N. D. Gibson, S. Spielman · 1 citation
Physics and Astronomy · Engineering · #Advanced Chemical Physics Studies #Atomic and Molecular Physics #Laser-induced spectroscopy and plasma #Atomic physics #Thallium #Electron affinity (data page) #Ground state #Hyperfine structure #Electron #Spectroscopy #Physics #Ion #Atom (system on chip) #Photon energy #Range (aeronautics) #Photon #Energy (signal processing) #Materials science #Optics #Molecule #Nuclear physics

paper · doi:10.1103/physreva.101.052511

openalex publication_date 2020/05/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The electron affinity of thallium has been precisely measured using laser photodetachment threshold spectroscopy. The relative photodetachment cross section from the negative ion ²⁰⁵Tl^\ensuremath- was measured using a tunable infrared laser over the photon energy range 300--900 meV (4130--1380 nm). A pair of closely spaced s-wave thresholds were observed due to transitions from the negative ion ground state Tl^\ensuremath- (6p²³P₀) to the two hyperfine levels of the neutral atom ground state Tl (6p²P_1/2, F=0,1), which determines the electron affinity of ²⁰⁵Tl to be 320.053(19) meV. These results substantially improve the precision of the Tl electron affinity and resolve long-standing discrepancies in the literature between previous experimental and theoretical values.

Citations

• Electron affinity of Bi using infrared laser photodetachment threshold spectroscopy
• Binding energies in atomic negative ions
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Cited by

• Electron affinity (data page) [wikipedia]