{
  "annotation_id": "30eee5c8-fafd-4414-8f31-563b587a6471",
  "date_created": "2026-03-02T18:00:43.528000Z",
  "date_modified": "2026-03-02T18:00:43.528000Z",
  "file_hash": "ca07cca61e2b1cfd21edd03a8ad3f7570316c6043f482db07879c181c6a453af",
  "private": false,
  "record": {
    "abstract": "We discuss the possibility of using pair-equations for the construction of\nthe effective Hamiltonian $H_{\\rm eff}$ for valence electrons of an atom. The\nlow-energy part of atomic spectrum is found by solving the eigenvalue problem\nfor $H_{\\rm eff}$. In this way it is possible to account efficiently for the\nvalence-valence and core-valence correlations. We tested this method on a toy\nmodel of a four-electron atom with the core $1s^2$. The spectrum obtained with\n$H_{\\rm eff}$ for two valence electrons is in a perfect agreement with the full\nconfiguration interaction for all four electrons.",
    "arxiv_id": "physics/0306061",
    "authors": [
      "M G Kozlov"
    ],
    "categories": [
      "physics.atom-ph",
      "physics.comp-ph"
    ],
    "journal_ref": "Int. J. Quant. Chem. 100, 336 (2004)",
    "title": "Precision calculations of atoms with few valence electrons",
    "url": "https://arxiv.org/abs/physics/0306061"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "07cb75e9-8e2c-43c4-85a6-1ee4a2c60365",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}