{
  "annotation_id": "06b3d381-7829-4a6d-b8ce-4766c1c3b4f1",
  "date_created": "2026-03-02T18:00:32.437000Z",
  "date_modified": "2026-03-02T18:00:32.437000Z",
  "file_hash": "a31dda6eff809a214ec478b13af5dba46bbd0310876cdafe5e98d7efa8f2abd2",
  "private": false,
  "record": {
    "abstract": "We discuss the final stages of double ionization of atoms in a strong\nlinearly polarized laser field within a classical model. We propose that all\ntrajectories leading to non-sequential double ionization pass close to a saddle\nin phase space which we identify and characterize. The saddle lies in a two\ndegree of freedom subspace of symmetrically escaping electrons. The\ndistribution of longitudinal momenta of ions as calculated within the subspace\nshows the double hump structure observed in experiments. Including a symmetric\nbending mode of the electrons allows us to reproduce the transverse ion\nmomenta. We discuss also a path to sequential ionization and show that it does\nnot lead to the observed momentum distributions.",
    "arxiv_id": "physics/0010031",
    "authors": [
      "Krzysztof Sacha",
      "Bruno Eckhardt"
    ],
    "categories": [
      "physics.atom-ph",
      "nlin.CD",
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.63.043414",
    "journal_ref": "Phys. Rev. A 63, 043414 (2001).",
    "title": "Pathways to double ionization of atoms in strong fields",
    "url": "https://arxiv.org/abs/physics/0010031"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1ec02c60-2490-4488-a1ee-4a5f93a9fee1",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}