{
  "annotation_id": "9a6f9582-b167-454d-b6c3-646870bb0262",
  "date_created": "2026-03-02T18:01:21.639000Z",
  "date_modified": "2026-03-02T18:01:21.639000Z",
  "file_hash": "159425e90deae804a24384e1d6a84726c0b90b65811d51d7283a96152db783ce",
  "private": false,
  "record": {
    "abstract": "The photodetachment cross section of He^- has been measured in the photon\nenergy range 2.9 eV to 3.3 eV in order to investigate doubly excited states.\nMeasurements were made channel specific by selectively detecting the residual\nHe atoms left in a particular excited state following detachment. Three\nFeshbach resonances were found in the He(1s2p ^3P)+e^-(epsilon p) partial cross\nsection: a ^4S resonance below the He(1s3s ^3S) threshold and two ^4P\nresonances below the He(1s3p ^3P) threshold. The measured energies of these\ndoubly excited states are 2.959260(6) eV, 3.072(7) eV and 3.26487(4) eV. The\ncorresponding widths are found to be 0.20(2) meV, 50(5) meV and 0.61(5) meV.\nThe measured energies agree well with recent theoretical predictions for the\n1s3s4s ^4S, 1s3p^2 ^4P and 1s3p4p ^4P states, respectively, but the widths\ndeviate noticeably from calculations for 1s3p^2 ^4P and 1s3p4p ^4P states.",
    "arxiv_id": "physics/9801032",
    "authors": [
      "Andreas E. Klinkmueller",
      "G. Haeffler",
      "D. Hanstorp",
      "I. Yu. Kiyan",
      "U. Berzinsh",
      "D. J. Pegg"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1088/0953-4075/31/11/016",
    "journal_ref": "Journal of Physics B, Vol. 31, pages 2549-2557, (1998)",
    "title": "Photodetachment study of He^- quartet resonances below the He(n=3)   thresholds",
    "url": "https://arxiv.org/abs/physics/9801032"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "17607c1e-1399-4b6a-a098-4821414176fe",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}