{
  "annotation_id": "98fc4355-5bf5-4b1e-87ce-b3cf570915eb",
  "date_created": "2026-03-02T18:00:46.730000Z",
  "date_modified": "2026-03-02T18:00:46.730000Z",
  "file_hash": "b19233df3fe97643427a9ba187754ad17a43252ed3fef16ff9ca2911f762aa1a",
  "private": false,
  "record": {
    "abstract": "The lifetime of the 3d^2D_5/2-level in singly-ionized calcium has been\nmeasured by the electron-shelving technique on different samples of rf trapped\nions. The metastable state has been directly populated by exciting the\ndipole-forbidden 4S_1/2 - 3D_5/2 transition. In ion clouds, the natural\nlifetime of this metastable level has been measured to be (1095+-27) ms. For\nthe single-ion case, we determined a lifetime of (1152+-20) ms. The\n1sigma-error bars at the 2%-level have different origins for the two kinds of\nexperiments: data fitting methods for lifetime measurements in an ion cloud and\ncontrol of experimental parameters for a single ion. De-shelving effects are\nextensively discussed. The influence of differing approaches for the processing\nof the single-ion quantum jump data on the lifetime values is shown. Comparison\nwith recent measurements shows excellent agreement when evaluated from a given\nmethod.",
    "arxiv_id": "physics/0309094",
    "authors": [
      "Martina Knoop",
      "Caroline Champenois",
      "Ga\u00ebtan Hagel",
      "Marie Houssin",
      "Caroline Lisowski",
      "Michel Vedel",
      "Fernande Vedel"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1140/epjd/e2004-00022-6",
    "title": "Metastable level lifetimes from electron-shelving measurements with ion   clouds and single ions",
    "url": "https://arxiv.org/abs/physics/0309094"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "77cd04a6-45fb-47ea-9c73-89c280fc65c9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}