{
  "annotation_id": "88605fcf-4cb6-4abf-ba6c-3b3c66490423",
  "date_created": "2026-03-02T18:00:32.236000Z",
  "date_modified": "2026-03-02T18:00:32.236000Z",
  "file_hash": "f44ab9deff5791a37e39492ff05c337f338f2fc7e3b0dbc672f1cb34ea50a380",
  "private": false,
  "record": {
    "abstract": "Frequency shifts of the ^199Hg^+ 5d^10 6s ^2S_1/2 (F=0, M_F=0) to 5d^9 6s^2\n^2D_5/2 (F=2, M_F=0) electric-quadrupole transition at 282 nm due to external\nfields are calculated, based on a combination of measured atomic parameters and\nab initio calculations. This transition is under investigation as an optical\nfrequency standard. The perturbations calculated are the quadratic Zeeman\nshift, the scalar and tensor quadratic Stark shifts, and the interaction\nbetween an external electric field gradient and the atomic quadrupole moment.\nThe quadrupole shift is likely to be the most difficult to evaluate in a\nfrequency standard and may have a magnitude of about 1 Hz for a single ion in a\nPaul trap.",
    "arxiv_id": "physics/0010056",
    "authors": [
      "W. M. Itano"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "title": "External-field shifts of the 199Hg+ optical frequency standard",
    "url": "https://arxiv.org/abs/physics/0010056"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "c80cbd2d-c8b3-43be-ab16-34edb8f3c7b6",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}