{
  "annotation_id": "0ade11f8-d7c5-4613-b62f-a902c7191460",
  "date_created": "2026-03-02T18:01:18.487000Z",
  "date_modified": "2026-03-02T18:01:18.487000Z",
  "file_hash": "4ff301b6952edffb069762aa708ff87277a9c319b8ae997bcafffdd60b4b47cc",
  "private": false,
  "record": {
    "abstract": "Theoretical investigations of the hyperfine structure of the hydrogen\nmolecular ion (one electron and two protons) are discussed. The nuclear\nspin-rotation interaction has been found to be of the same sign as in the\nhydrogen molecule and the hyperfine transition frequencies can be accurately\npredicted. With measurements of the hyperfine structure of the deuterium\nmolecular ion (or of HD+) it should be possible to obtain a value of the\ndeuteron quadrupole moment that could be compared with the values obtained from\nthe deuterium molecule and from nuclear theory.",
    "arxiv_id": "physics/9701007",
    "authors": [
      "J. F. Babb"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "journal_ref": "Current Topics in Physics, eds. YM Cho, JB Hong, CN Yang, 1998,\n  World Scientific, p. 531",
    "title": "The hyperfine structure of the hydrogen molecular ion",
    "url": "https://arxiv.org/abs/physics/9701007"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e8f54b28-ff8a-484d-b360-b0e1b0d1c09b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}