{
  "annotation_id": "513deec8-3dc1-4302-923a-46ab1b44dcef",
  "date_created": "2026-03-02T18:01:24.771000Z",
  "date_modified": "2026-03-02T18:01:24.771000Z",
  "file_hash": "2dd0bb59a2ca27b4d5a4207cba82757281386061b0369f98c285d2ccc1034128",
  "private": false,
  "record": {
    "abstract": "This paper presents an analysis of the motion of an impurity ion in a\nnanometer scale $^4$He cluster. Due to induction forces, ions are strongly\nlocalized near the center of the cluster, with a root mean squared thermal\ndisplacements of only a few \\AA. The trapping potential is found to be nearly\nharmonic, with a frequency of 2.3(1.0) GHz for a positive (negative) ion in a\nHe cluster of radius 5 nm. The anharmonicity is small and positive (energy\nincreases slightly faster than linear with quantum number). It is suggested\nthat by using frequency sweep microwave radiation, it should be possible to\ndrive the ion center of mass motion up to high quantum numbers, allowing the\nstudy of the critical velocity as a function of cluster size.",
    "arxiv_id": "physics/9905009",
    "authors": [
      "Kevin K. Lehmann",
      "Jan A. Northby"
    ],
    "categories": [
      "physics.chem-ph"
    ],
    "doi": "10.1080/002689799163488",
    "journal_ref": "Mol. Phys. 82, 639-644 (1999)",
    "title": "Potential of an ionic impurityin a large $^4$He cluster",
    "url": "https://arxiv.org/abs/physics/9905009"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "9137e2de-4bd1-4799-b727-86b36de179c1",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}