{
  "annotation_id": "9a1a2c0c-eb13-4648-96d6-c7274639dc70",
  "date_created": "2026-03-02T18:01:03.475000Z",
  "date_modified": "2026-03-02T18:01:03.475000Z",
  "file_hash": "66b661cea9a0da60b08e5b30f0a0ed64ae5a9ddbcda0e03cfac045245b1f37e2",
  "private": false,
  "record": {
    "abstract": "We use the phenomenon of electromagnetically-induced transparency in a\nthree-level atomic system for hyperfine spectroscopy of upper states that are\nnot directly coupled to the ground state. The three levels form a ladder\nsystem: the probe laser couples the ground state to the lower excited state,\nwhile the control laser couples the two upper states. As the frequency of the\ncontrol laser is scanned, the probe absorption shows transparency peaks\nwhenever the control laser is resonant with a hyperfine level of the upper\nstate. As an illustration of the technique, we measure hyperfine structure in\nthe $7S_{1/2}$ states of $^{85}$Rb and $^{87}$Rb, and obtain an improvement of\nmore than an order of magnitude over previous values.",
    "arxiv_id": "physics/0510135",
    "authors": [
      "Anusha Krishna",
      "Kanhaiya Pandey",
      "Ajay Wasan",
      "Vasant Natarajan"
    ],
    "categories": [
      "physics.optics",
      "physics.atom-ph"
    ],
    "doi": "10.1209/epl/i2005-10228-6",
    "journal_ref": "Europhys. Lett., 72 (2), pp. 221-227 (2005)",
    "title": "High-resolution hyperfine spectroscopy of excited states using   electromagnetically-induced transparency",
    "url": "https://arxiv.org/abs/physics/0510135"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "88b19988-1754-4eef-8e4e-fc610dfad7fc",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}