{
  "annotation_id": "9cdbe77d-b04e-4cdd-bb4a-7395fb280206",
  "date_created": "2026-03-02T18:02:20.698000Z",
  "date_modified": "2026-03-02T18:02:20.698000Z",
  "file_hash": "e2c378075405672c8890d52cb49f016553f01844316fd1716fc2267b08469a88",
  "private": false,
  "record": {
    "abstract": "Using techniques of complex analysis in an algebraic approach, we solve the\nwave equation for a two-level atom interacting with a monochromatic light field\nexactly. A closed-form expression for the quasi-energies is obtained, which\nshows that the Bloch-Siegert shift is always finite, regardless of whether the\noriginal or the shifted level spacing is an integral multiple of the driving\nfrequency, $\\omega$. We also find that the wave functions, though finite when\nthe original level spacing is an integral multiple of $\\omega$, become\ndivergent when the intensity-dependent shifted energy spacing is an integral\nmultiple of the photon energy. This result provides, for the first time in the\nliterature, an ab-initio theoretical explanation for the occurrence of the\nFreeman resonances observed in above-threshold ionization experiments.",
    "arxiv_id": "quant-ph/0509135",
    "authors": [
      "Dong-Sheng Guo",
      "Yong-Shi Wu",
      "Linn Van Woerkom"
    ],
    "categories": [
      "quant-ph",
      "physics.atom-ph",
      "physics.optics"
    ],
    "doi": "10.1103/PhysRevA.73.023419",
    "title": "Exact Solution for a Two-Level Atom in Radiation Fields and the Freeman   Resonances",
    "url": "https://arxiv.org/abs/quant-ph/0509135"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "92432f5b-850a-44e2-a6c4-164efe113e29",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}