4.8 Article

The electron affinity of astatine

期刊

NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -

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NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-020-17599-2

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资金

  1. Swedish Research Council
  2. Center for Information Technology of the University of Groningen
  3. French National Agency for Research [ANR-11EQPX-0004, ANR-11-LABX-0018]
  4. Office of Nuclear Physics, U.S. Department of Energy [DE-AC05-00OR22725]
  5. European Union Horizon 2020 research and innovation programme [654002]
  6. European Union innovative training network fellowship [642889]
  7. Slovak Research and Development Agency [APVV-15-0105]
  8. Scientific Grant Agency of the Slovak Republic [1/0777/19]
  9. Bundesministerium fur Bildung und Forschung (BMBF, Germany) [05P12UMCIA, 05P15UMCIA, 05P18UMCIA]
  10. FNPMLS ERC Consolidator Grant [64838]
  11. FWO-Vlaanderen (Belgium)
  12. KU Leuven [GOA 15/010]

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One of the most important properties influencing the chemical behavior of an element is the electron affinity (EA). Among the remaining elements with unknown EA is astatine, where one of its isotopes, At-211, is remarkably well suited for targeted radionuclide therapy of cancer. With the At- anion being involved in many aspects of current astatine labeling protocols, the knowledge of the electron affinity of this element is of prime importance. Here we report the measured value of the EA of astatine to be 2.41578(7)eV. This result is compared to state-of-the-art relativistic quantum mechanical calculations that incorporate both the Breit and the quantum electrodynamics (QED) corrections and the electron-electron correlation effects on the highest level that can be currently achieved for many-electron systems. The developed technique of laser-photodetachment spectroscopy of radioisotopes opens the path for future EA measurements of other radioelements such as polonium, and eventually super-heavy elements. Electron affinity (EA) is a key parameter in determining the chemical behavior of the elements, but challenging to measure for unstable atoms. Here the authors succeed in measuring the EA of astatine, the heaviest naturally occurring halogen, and compare it with predictions from relativistic calculations.

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