{
  "annotation_id": "f35c5383-bd69-45c1-bc32-59e9a7ef03a4",
  "date_created": "2026-03-02T18:00:32.176000Z",
  "date_modified": "2026-03-02T18:00:32.176000Z",
  "file_hash": "5639390f34f899684c459c943abd6a7168b23a190126ffd63f575f3109a6283c",
  "private": false,
  "record": {
    "abstract": "The ground and a few excited states of the beryllium atom in external uniform\nmagnetic fields are calculated by means of our 2D mesh Hartree-Fock method for\nfield strengths ranging from zero up to 2.35*10^9T. With changing field\nstrength the ground state of the Be atom undergoes three transitions involving\nfour different electronic configurations which belong to three groups with\ndifferent spin projections S_z=0,-1,-2. For weak fields the ground state\nconfiguration arises from the 1s^2 2s^2, S_z=0 configuration. With increasing\nfield strength the ground state evolves into the two S_z=-1 configurations\n1s^22s 2p_{-1} and 1s^2 2p_{-1}3d_{-2}, followed by the fully spin polarised\nS_z=-2 configuration 1s2p_{-1}3d_{-2}4f_{-3}. The latter configuration forms\nthe ground state of the beryllium atom in the high field regime \\gamma\u003e4.567.\nThe analogous calculations for the Be^+ ion provide the sequence of the three\nfollowing ground state configurations: 1s^22s and 1s^22p_{-1} (S_z=-1/2) and\n1s2p_{-1}3d_{-2} (S_z=-3/2).",
    "arxiv_id": "physics/0009004",
    "authors": [
      "M. V. Ivanov",
      "P. Schmelcher"
    ],
    "categories": [
      "physics.atom-ph",
      "physics.chem-ph",
      "physics.space-ph"
    ],
    "doi": "10.1007/s100530170194",
    "title": "The beryllium atom and beryllium positive ion in strong magnetic fields",
    "url": "https://arxiv.org/abs/physics/0009004"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f34b8023-51e1-49c4-bb7a-7f5d435f8c9d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}