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      "scope": {
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        "domain": "Optics and photonics"
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        {
          "citation": "Gordon, Zeiger and Townes, Molecular Microwave Oscillator and New Hyperfine Structure in the Microwave Spectrum of NH3",
          "url": "https://journals.aps.org/pr/abstract/10.1103/PhysRev.95.282"
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          "citation": "Gordon, Zeiger and Townes, The Maser—New Type of Microwave Amplifier, Frequency Standard, and Spectrometer",
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      "statement": "# Gordon, Zeiger and Townes: the ammonia-beam maser\n\nReported a molecular microwave oscillator using stimulated emission in an ammonia beam and developed it as a narrow-band amplifier, oscillator, frequency standard and spectrometer.\n\n## Scientific scope\n\nThe record covers the three-author 1954 paper and detailed 1955 follow-up. Independent precursor proposals, later maser and laser implementations and broader quantum-optics history require separate attribution.\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\nJames P. Gordon; Herbert J. Zeiger; Charles H. Townes\n\nThe named authors contributed to this scoped work; individual effort shares and later applications are not assigned by the byline.\n\n\n\n## Original sources\n\n- [Gordon, Zeiger and Townes, Molecular Microwave Oscillator and New Hyperfine Structure in the Microwave Spectrum of NH3](https://journals.aps.org/pr/abstract/10.1103/PhysRev.95.282)\n- [Gordon, Zeiger and Townes, The Maser—New Type of Microwave Amplifier, Frequency Standard, and Spectrometer](https://journals.aps.org/pr/abstract/10.1103/PhysRev.99.1264)\n",
      "summary": "Reported a molecular microwave oscillator using stimulated emission in an ammonia beam and developed it as a narrow-band amplifier, oscillator, frequency standard and spectrometer.",
      "title": "Gordon, Zeiger and Townes: the ammonia-beam maser"
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    "id": "townes-maser-1954",
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    "title": "Gordon, Zeiger and Townes: the ammonia-beam maser",
    "context": "Experimental physics",
    "track": "Stimulated-emission microwave device",
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    "status": "PROVISIONAL_EDITORIAL",
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    "scope": "1954 reported oscillator with 1955 same-team follow-up; exclude later optical lasers and independent Basov-Prokhorov work.",
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      {
        "title": "Gordon, Zeiger and Townes, Molecular Microwave Oscillator and New Hyperfine Structure in the Microwave Spectrum of NH3",
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