{
  "annotation_id": "f4164ecb-88f0-47d7-a5e8-8a58ce06a184",
  "date_created": "2026-03-02T18:01:21.477000Z",
  "date_modified": "2026-03-02T18:01:21.477000Z",
  "file_hash": "6d69c5500507c28be6ff561374995222d59767b193463e796f998ac274a6f418",
  "private": false,
  "record": {
    "abstract": "We consider a hydrogenic system with a nucleus of finite mass. The coupling\nof the radiation field to the center of mass motion gives rise to an effective\nscalar type coupling. This induced scalar photon interaction emerges as a\ncorrection in competition with the usual multipole interactions. This effect is\nparticularly important in positronium where the electric quadrupole interaction\nis totally suppressed. We illustrate this effect with the two-photon decay of\nmetastable hydrogenic systems.",
    "arxiv_id": "physics/9801020",
    "authors": [
      "C. K. Au",
      "C. S. Chu"
    ],
    "categories": [
      "physics.atom-ph",
      "quant-ph"
    ],
    "doi": "10.1016/S0375-9601(98)00362-4",
    "journal_ref": "Phys. Lett. A244 (1998) 338",
    "title": "Finite Mass Effect on Two Photon Processes in Hydrogenic Systems:   Effective Scalar Photon Interaction",
    "url": "https://arxiv.org/abs/physics/9801020"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "64bcd585-0e2c-4657-8498-3160fc19e964",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}