{
  "annotation_id": "035723a0-7290-443f-9b56-80f928909898",
  "date_created": "2026-03-02T18:00:39.824000Z",
  "date_modified": "2026-03-02T18:00:39.824000Z",
  "file_hash": "62d70e5346b37b5e8fed58ff6c6eb64f818f2d2f46a156e881f90f9d4b90eba9",
  "private": false,
  "record": {
    "abstract": "We demonstrate a technique for directly measuring the fine-structure interval\nin alkali atoms using two frequency-stabilized diode lasers. Each laser has a\nlinewidth of order 1 MHz and precise tunability: one laser is tuned to a\nhyperfine transition in the D_1 line, and the other laser to a hyperfine\ntransition in the D_2 line. The outputs of the lasers are fed into a scanning\nMichelson interferometer that measures the ratio of their wavelengths\naccurately. To illustrate the technique, we measure the fine-structure interval\nin Rb, and obtain a value of 237.6000(3)(5) cm^-1 for the hyperfine-free\n5P_{3/2} - 5P_{1/2} interval.",
    "arxiv_id": "physics/0204020",
    "authors": [
      "Ayan Banerjee",
      "Umakant D. Rapol",
      "Vasant Natarajan"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1063/1.1480890",
    "journal_ref": "Applied Physics Letters, vol. 80, no. 20, 3688-3690 (2002).",
    "title": "Direct measurement of the fine-structure interval in alkali atoms using   diode lasers",
    "url": "https://arxiv.org/abs/physics/0204020"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "7761729a-19b6-499e-b391-5cd9f94f8abc",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}