{
  "annotation_id": "fb50d36e-8822-411f-bb20-d69dc2c71e9d",
  "date_created": "2026-03-02T18:00:39.667000Z",
  "date_modified": "2026-03-02T18:00:39.667000Z",
  "file_hash": "a34fa3d96693643e12534270e34b9348fe638721a9b74d48f91fe8d79f97c4b1",
  "private": false,
  "record": {
    "abstract": "We investigate the cyclic polyenes (annulenes) C_{M}H_{M}, described by the\nPariser--Parr--Pople (PPP) model, by means of the approximate coupled-pair\ntheories (ACP, ACPQ). For the systems with the spectroscopic value of the PPP\nresonance integral beta=2.5 eV, the ACP method breaks down for M \u003e= 446, and\nthe ACPQ method--for M\u003e194. In the ACPQ method, for M\u003e170, two close lying\nsolutions have been observed that become quasi-degenerate for M \u003e= 198. The\nresults indicate that the ACP and ACPQ methods cannot be applied to the\none-dimensional metallic case.",
    "arxiv_id": "physics/0208076",
    "authors": [
      "R. Podeszwa"
    ],
    "categories": [
      "physics.chem-ph"
    ],
    "doi": "10.1016/S0009-2614(02)01451-3",
    "journal_ref": "Chem. Phys. Lett. vol. 365, 211 (2002)",
    "title": "Electronic correlation in cyclic polyenes. Behavior of approximate   coupled-pair theories for large rings",
    "url": "https://arxiv.org/abs/physics/0208076"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "20626f48-1e2a-4e0b-895a-d5a5fdd95e97",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}