The ratio of the electron-spin g factor to the proton g factor has been measured in atomic hydrogen by a precision microwave magnetic resonance absorption technique. The result obtained is -gₛgₚ=658.2277±0.0002, where gₚ refers to protons in molecular hydrogen. The ratio is in good agreement with the atomic-beam result of Koenig, Prodell, and Kusch, and verifies their conclusions concerning the magnitude of the quantum electrodynamical contribution to gₛ.
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Beringer et al. (1954) studied this question.
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