{
  "annotation_id": "a3497f22-78d5-460f-85ac-44aee5380226",
  "date_created": "2026-03-02T18:00:32.766000Z",
  "date_modified": "2026-03-02T18:00:32.766000Z",
  "file_hash": "a3fb7b121198e19d6d2bec1649f777ea9a9b4f2d120d49eff5d11d78106ff851",
  "private": false,
  "record": {
    "abstract": "The scattering of ortho positronium (Ps) by H$_2$ has been investigated using\na three-Ps-state [Ps(1s,2s,2p)H$_2($X $^1\\Sigma_g^+$)] coupled-channel model\nand using Born approximation for higher excitations and ionization of Ps and B\n$^1\\Sigma_u^+$ and b $^3\\Sigma_u^+$ excitations of H$_2$. We employ a recently\nproposed time-reversal-symmetric nonlocal electron-exchange model potential. We\npresent a calculational scheme for solving the body-frame fixed-nuclei\ncoupled-channel scattering equations for Ps-H$_2$, which simplifies the\nnumerical solution technique considerably. Ps ionization is found to have the\nleading contribution to target-elastic and all target-inelastic processes. The\ntotal cross sections at low and medium energies are in good agreement with\nexperiment.",
    "arxiv_id": "physics/0012039",
    "authors": [
      "P. K. Biswas",
      "Sadhan K. Adhikari"
    ],
    "categories": [
      "physics.atm-clus",
      "physics.chem-ph"
    ],
    "doi": "10.1088/0953-4075/33/8/308",
    "journal_ref": "J. Phys. B, 33 (2000) 1575-1584",
    "title": "Positronium atom scattering by H_2 in a coupled-channel framework",
    "url": "https://arxiv.org/abs/physics/0012039"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f19fca09-9e4e-4bf1-8945-cf68edfd0f92",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}