{
  "annotation_id": "452c557f-e074-41b6-a3d6-d0434c46b4d1",
  "date_created": "2026-03-02T18:01:21.835000Z",
  "date_modified": "2026-03-02T18:01:21.835000Z",
  "file_hash": "aba991fd8d875213e7f091c989ce9b276435705b32003891409fdd60731137c3",
  "private": false,
  "record": {
    "abstract": "We have observed Bose-Einstein condensation (BEC) of trapped atomic hydrogen,\nand studied it by two-photon spectroscopy of the 1S-2S transition. In these\nlecture notes we briefly review the history of spin-polarized atomic hydrogen\nand describe the final steps to BEC. Laser spectroscopy, which probes the\ndifference in mean field energy of the 1S and 2S states, is used to study the\ncondensate, which has a peak density of 4.8e15 cm^-3 and population of 10^9.",
    "arxiv_id": "physics/9812038",
    "authors": [
      "Daniel Kleppner",
      "Thomas J. Greytak",
      "Thomas C. Killian",
      "Dale G. Fried",
      "Lorenz Willmann",
      "David Landhuis",
      "Stephen C. Moss"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "title": "Bose-Einstein Condensation of Atomic Hydrogen",
    "url": "https://arxiv.org/abs/physics/9812038"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d5ce67f4-45d1-4cf5-8f0e-49e8769ea75c",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}