{
  "annotation_id": "22304d5e-6524-4e96-85b1-cc0a078f4832",
  "date_created": "2026-03-02T18:01:21.564000Z",
  "date_modified": "2026-03-02T18:01:21.564000Z",
  "file_hash": "4027c22455fbe05087d2615170d9ffe638b1ae8d58db513bc32648bac6f21fe8",
  "private": false,
  "record": {
    "abstract": "We study hydrogen plasmas at magnetic fields B ~ 10^{12}-10^{13} Gauss,\ndensities ~ 10^{-3}-10^3 g/cc and temperatures T ~ 10^{5.5}-10^{6.5} K, typical\nof photospheres of middle-aged cooling neutron stars. We construct an\nanalytical free energy model of the partially ionized plasma, including into\nconsideration the decentred atomic states, which arise due to the thermal\nmotion across the strong field. We show that these states, neglected in\nprevious studies, may contribute appreciably into thermodynamics of the outer\natmospheric layers at density below 1 g/cc and typical B and T. We take into\naccount Coulomb non-ideality of the ionized component of the plasma affected by\nintense magnetic field. Ionization degree, occupancies and equation of state\nare calculated, and their dependences on the temperature, density and magnetic\nfield are studied.",
    "arxiv_id": "physics/9811051",
    "authors": [
      "A. Y. Potekhin",
      "G. Chabrier",
      "Yu. A. Shibanov",
      "J. Ventura"
    ],
    "categories": [
      "physics.plasm-ph",
      "astro-ph"
    ],
    "doi": "10.1002/ctpp.2150390125",
    "journal_ref": "Contrib. Plasma Physics 39 (1999) 101",
    "title": "Ionization equilibrium and equation of state of hydrogen plasmas in   strong magnetic fields",
    "url": "https://arxiv.org/abs/physics/9811051"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b307e9d9-a455-4a5f-a148-e99909a8081e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}