{
  "annotation_id": "ee2305b3-47d9-4cf1-a57c-42d9c820866a",
  "date_created": "2026-03-02T18:00:56.999000Z",
  "date_modified": "2026-03-02T18:00:56.999000Z",
  "file_hash": "5430030787bee929d1be179ea9bb47cb79f25e0b9642bf67b9f5bb14b3bc6104",
  "private": false,
  "record": {
    "abstract": "We report the direct excitation of the highly forbidden (6s^2) 1S0 - (6s6p)\n3P0 optical transition in two odd isotopes of ytterbium. As the excitation\nlaser frequency is scanned, absorption is detected by monitoring the depletion\nfrom an atomic cloud at ~70 uK in a magneto-optical trap. The measured\nfrequency in 171Yb (F=1/2) is 518,295,836,593.2 +/- 4.4 kHz. The measured\nfrequency in 173Yb (F=5/2) is 518,294,576,850.0 +/- 4.4 kHz. Measurements are\nmade with a femtosecond-laser frequency comb calibrated by the NIST cesium\nfountain clock and represent nearly a million-fold reduction in uncertainty.\nThe natural linewidth of these J=0 to J=0 transitions is calculated to be ~10\nmHz, making them well-suited to support a new generation of optical atomic\nclocks based on confinement in an optical lattice.",
    "arxiv_id": "physics/0503240",
    "authors": [
      "C. W. Hoyt",
      "Z. W. Barber",
      "C. W. Oates",
      "T. M. Fortier",
      "S. A. Diddams",
      "L. Hollberg"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1103/PhysRevLett.95.083003",
    "title": "Observation and absolute frequency measurements of the 1S0 - 3P0 optical   clock transition in ytterbium",
    "url": "https://arxiv.org/abs/physics/0503240"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "bbfe90a0-bd83-4113-b95c-5aa9d86d6dcf",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}