{
  "annotation_id": "f33e3fb0-934c-4fdc-8390-890684d73c5f",
  "date_created": "2026-03-02T18:01:11.454000Z",
  "date_modified": "2026-03-02T18:01:11.454000Z",
  "file_hash": "3a0df0dfa65021b43677028db836c92384bb46a62458b197328303395cb1ec9c",
  "private": false,
  "record": {
    "abstract": "A second plateau in the harmonic spectra of laser-driven two-electron atoms\nis observed both in the numerical solution of a low-dimensional model helium\natom and using an extended strong field approximation. It is shown that the\nharmonics well beyond the usual cut-off are due to the simultaneous\nrecombination of the two electrons, which were emitted during different,\nprevious half-cycles. The new cut-off is explained in terms of classical\ntrajectories. Classical predictions and the time-frequency analysis of the ab\ninitio quantum results are in excellent agreement. The mechanism corresponds to\nthe inverse single photon double ionization process in the presence of a (low\nfrequency) laser field.",
    "arxiv_id": "physics/0609010",
    "authors": [
      "P. Koval",
      "F. Wilken",
      "D. Bauer",
      "C. H. Keitel"
    ],
    "categories": [
      "physics.atom-ph",
      "physics.optics"
    ],
    "doi": "10.1103/PhysRevLett.98.043904",
    "title": "Nonsequential Double Recombination in Intense Laser Fields",
    "url": "https://arxiv.org/abs/physics/0609010"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "9c3dcbfc-819d-4f68-b169-ca2ae3f87512",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}