{
  "annotation_id": "e08f5a92-16e9-4fb1-895b-5434789f9e1e",
  "date_created": "2026-03-02T18:00:39.898000Z",
  "date_modified": "2026-03-02T18:00:39.898000Z",
  "file_hash": "886190c8ccb4f2324c72956055fcb442524fd42dc0ec27f39dc6fc6d5b55c748",
  "private": false,
  "record": {
    "abstract": "We demonstrate a technique for precisely measuring hyperfine intervals in\nalkali atoms. The atoms form a three-level $\\Lambda$ system in the presence of\na strong control laser and a weak probe laser. The dressed states created by\nthe control laser show significant linewidth reduction. We have developed a\ntechnique for Doppler-free spectroscopy that enables the separation between the\ndressed states to be measured with high accuracy even in room-temperature\natoms. The states go through an avoided crossing as the detuning of the control\nlaser is changed from positive to negative. By studying the separation as a\nfunction of detuning, the center of the level-crossing diagram is determined\nwith high precision, which yields the hyperfine interval. Using\nroom-temperature Rb vapor, we obtain a precision of 44 kHz. This is a\nsignificant improvement over the current precision of ~ 1 MHz.",
    "arxiv_id": "physics/0209020",
    "authors": [
      "Umakant D. Rapol",
      "Vasant Natarajan"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1209/epl/i2002-00338-1",
    "journal_ref": "Europhys. Lett., 60 (2), pp. 195--200 (2002)",
    "title": "Precise measurement of hyperfine intervals using avoided crossing of   dressed states",
    "url": "https://arxiv.org/abs/physics/0209020"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "bcc0499c-6d05-4be6-8b4f-6dd7ba90254a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}