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        "description": "The uncertainty includes statistical and apparatus-model contributions, with waveguide misalignment the largest listed systematic effect. The inferred 2P interval shares an earlier experiment and is not a separate direct measurement. Printed statistical consistency, normalization and model conventions require clarification; the original data and analysis code were not independently replayed. Agreement with the authors’ QED benchmark applies at this experimental precision. Higher-flux beams, sub-MHz precision and new symmetry tests remained prospective. The linked 2025 theory table excludes a listed hyperfine correction; including that term reconciles its central values with the experimental paper’s quoted benchmarks. Its symmetry-test models and Ramsey precision estimates are prospective.",
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          "citation": "Microwave spectroscopy of the muonium 2S1/2–2P3/2 fine structure interval (PRA113012817)",
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      "statement": "# Microwave measurement of the muonium 2S–2P3/2 interval\n\nBlumer and colleagues measured the muonium 2S₁/₂–2P₃/₂ interval using microwave-induced depletion of a metastable beam and coincidence detection of Lyman-alpha photons. Five muonium scans with different powers, moderator gases and propagation directions gave 9871.0±7.0 MHz. Hydrogen reference measurements and simulated microwave fields supported the line-shape analysis. Combining the result with an earlier Lamb-shift measurement yielded an inferred 2P fine-structure interval of 10918.2±7.4 MHz.\n\n## Scientific scope\n\nThe uncertainty includes statistical and apparatus-model contributions, with waveguide misalignment the largest listed systematic effect. The inferred 2P interval shares an earlier experiment and is not a separate direct measurement. Printed statistical consistency, normalization and model conventions require clarification; the original data and analysis code were not independently replayed. Agreement with the authors’ QED benchmark applies at this experimental precision. Higher-flux beams, sub-MHz precision and new symmetry tests remained prospective. The linked 2025 theory table excludes a listed hyperfine correction; including that term reconciles its central values with the experimental paper’s quoted benchmarks. Its symmetry-test models and Ramsey precision estimates are prospective.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nPhilipp Blumer; Gianluca Janka; Svenja Geissmann; Iren Ignatov; Marcus Mähring; Zaher Salman; Andreas Suter; Edward Thorpe-Woods; Thomas Prokscha; Ben Ohayon; Paolo Crivelli\n\nThese are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.\n\n\n\n## Original sources\n\n- [Microwave spectroscopy of the muonium 2S1/2–2P3/2 fine structure interval (PRA113012817)](https://www.dora.lib4ri.ch/psi/islandora/object/psi%3A83814/datastream/PDF/Blumer-2026-Microwave_spectroscopy_of_the_muonium-%28published_version%29.pdf)\n- [Muonium fine structure: theory update, tests of Lorentz violation, and experimental prospects (EPJD79:24)](https://inspirehep.net/files/2125adcf9abba496b15371efe9afb519)\n",
      "summary": "Blumer and colleagues measured the muonium 2S₁/₂–2P₃/₂ interval using microwave-induced depletion of a metastable beam and coincidence detection of Lyman-alpha photons. Five muonium scans with different powers, moderator gases and propagation directions gave 9871.0±7.0 MHz. Hydrogen reference measurements and simulated microwave fields supported the line-shape analysis. Combining the result with an earlier Lamb-shift measurement yielded an inferred 2P fine-structure interval of 10918.2±7.4 MHz.",
      "title": "Microwave measurement of the muonium 2S–2P3/2 interval"
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