{
  "annotation_id": "17360813-6fd2-452f-87e0-dffef0c4a917",
  "date_created": "2026-03-02T18:02:06.280000Z",
  "date_modified": "2026-03-02T18:02:06.280000Z",
  "file_hash": "cdddae868aedcab4edc9fac3b7c3ac9c3619190a69d4e599647d77451a537760",
  "private": false,
  "record": {
    "abstract": "Motivated by recent experiments we analyse the classical dynamics of a\nhydrogen atom in parallel static and microwave electric fields. Using an\nappropriate representation and averaging approximations we show that resonant\nionisation is controlled by a separatrix, and provide necessary conditions for\na dynamical resonance to affect the ionisation probability.\n  The position of the dynamical resonance is computed using a high-order\nperturbation series, and estimate its radius of convergence. We show that the\nposition of the dynamical resonance does not coincide precisely with the\nionisation maxima, and that the field switch-on time can dramatically affect\nthe ionisation signal which, for long switch times, reflects the shape of an\nincipient homoclinic. Similarly, the resonance ionisation time can reflect the\ntime-scale of the separatrix motion, which is therefore longer than\nconventional static field Stark ionisation. We explain why these effects should\nbe observed in the quantum dynamics.\n  PACs: 32.80.Rm, 33.40.+f, 34.10.+x, 05.45.Ac, 05.45.Mt",
    "arxiv_id": "quant-ph/0403139",
    "authors": [
      "D. Richards"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/1367-2630/7/1/138",
    "title": "The effect of parallel static and microwave electric fields on excited   hydrogen atoms",
    "url": "https://arxiv.org/abs/quant-ph/0403139"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b82cdc12-4bd7-4d69-b055-50e4d197adda",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}