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Related Experiment Videos

Electronic g factor of hydrogenlike oxygen 16O7+.

J Verdú1, S Djekić, S Stahl

  • 1Institut für Physik, Johannes-Gutenberg-Universität, D-55099 Mainz, Germany.

Physical Review Letters
|April 20, 2004
PubMed
Summary
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High-precision measurement of the atomic mass of the electron.

Nature·2014

Researchers measured the electron g factor in oxygen ions, achieving high precision. This experiment validates quantum electrodynamics and refines the electron mass value.

Area of Science:

  • Atomic Physics
  • Quantum Electrodynamics
  • Spectroscopy

Background:

  • The g factor of a bound electron is a fundamental constant.
  • Precise measurements test the limits of quantum electrodynamics (QED).
  • Previous measurements have provided valuable data but room for improvement exists.

Purpose of the Study:

  • To experimentally determine the g factor of an electron bound in hydrogenlike oxygen (16O7+).
  • To test the predictions of bound-state QED with high accuracy.
  • To obtain a refined value for the electron mass.

Main Methods:

  • A single 16O7+ ion was confined in a Penning trap.
  • The g-factor resonance was measured.
  • The line shape of the g-factor resonance was calculated for the first time to minimize systematic uncertainties.

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Main Results:

  • The experimental g factor was determined as g(expt)=2.000 047 025 4 (15)(44).
  • The measurement agrees with theoretical predictions within 1.1 standard deviations.
  • This represents a stringent test of bound-state QED at the 0.25% level.

Conclusions:

  • The experiment provides strong validation for bound-state QED.
  • A new, precise value for the electron mass was derived: m(e)=0.000 548 579 909 6 (4) u.
  • Combining this with previous results yields a significantly more precise electron mass value.