High precision measurements of two Zeeman hyperfine transitions in the ground state of muonium in a strong magnetic field have been made at LAMPF using microwave magnetic resonance spectroscopy and a resonance line narrowing technique. These determine the most precise values of the ground state hyperfine structure interval of muonium Δν0ex0ex=0ex0ex4463302765(53)Hz (12ppb), and of the ratio of magnetic moments μ_μ/μₚ0ex0ex=0ex0ex3.18334513(39) (120ppb), representing a factor of 3 improvement. Values of the mass ratio m_μ/mₑ and the fine structure constant α are derived from these results.
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Liu et al. (1999) studied this question.
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