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High-precision electron affinity of oxygen.

Moa K Kristiansson1, Kiattichart Chartkunchand2,3, Gustav Eklund2

  • 1Department of Physics, Stockholm University, Stockholm, Sweden. moa.kristiansson@fysik.su.se.

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|October 7, 2022
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This summary is machine-generated.

Scientists developed a new high-precision method to measure negative ion binding energies. This technique significantly improves upon previous methods, enabling more accurate studies in fields like interstellar chemistry and antimatter research.

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Area of Science:

  • Atomic and molecular physics
  • Quantum chemistry
  • Astrophysics and astrochemistry

Background:

  • Negative ions are crucial in diverse scientific fields, including interstellar chemistry, radionuclide dating, and antimatter research.
  • Electron-correlation effects dominate the properties of these unique quantum systems.
  • Atomic anions, typically loosely bound, lack optically allowed transitions, hindering high-resolution spectroscopy and detection.

Purpose of the Study:

  • To introduce a novel method for measuring negative ion binding energies with unprecedented precision.
  • To overcome limitations in high-resolution spectroscopy for atomic anions.
  • To demonstrate the method's applicability to general negative ions.

Main Methods:

  • Utilized laser manipulation of quantum-state populations to reduce background photodetachment from excited states.
  • Employed a cryogenic electrostatic ion-beam storage ring for circulating keV ion beams.
  • Achieved extended ion beam circulation times (up to hours) for enhanced measurement stability.

Main Results:

  • Achieved an order of magnitude improvement in precision for measuring negative ion binding energies.
  • Reported a highly precise electron affinity for the oxygen-16 (16O) anion: 1.461 112 972(87) eV.
  • Demonstrated the general applicability of the developed method to various negative ions.

Conclusions:

  • The new method significantly advances the precision of negative ion binding energy measurements.
  • This breakthrough enables more accurate investigations in fields reliant on negative ion properties.
  • The reported electron affinity for 16O provides a benchmark for theoretical and experimental studies.