{
  "annotation_id": "0d865e0b-1a4b-4c82-b960-1e5ce974c5dd",
  "date_created": "2026-03-02T18:01:24.771000Z",
  "date_modified": "2026-03-02T18:01:24.771000Z",
  "file_hash": "529e0d3c4f4d4ba6d6930b580f557670bd86a68559c266f0b6bdc4fb2945d327",
  "private": false,
  "record": {
    "abstract": "Purely rotational transitions of a molecule, such as HCCCN, embedded in large\n$^4$He clusters have been detected for the first time. The saturation behavior\nshows that, in contrast to previous expectations, the microwave line profiles\nare dominated by inhomogeneous broadening mechanisms. Spectral holes and peaks\nproduced by microwave-microwave double resonance have widths comparable to\nthose of single resonance lines, indicating that relaxation occurs among\nquantum states of the inhomogeneous distribution of each rotational level, at a\nrate approximately 10 times faster than rotationally inelastic relaxation.",
    "arxiv_id": "physics/9905022",
    "authors": [
      "I. Reinhard",
      "C. Callegari",
      "A. Conjusteau",
      "K. K. Lehmann",
      "G. Scoles"
    ],
    "categories": [
      "physics.chem-ph"
    ],
    "doi": "10.1103/PhysRevLett.82.5036",
    "journal_ref": "Phys.Rev.Lett. 82, 5036 (1999)",
    "title": "Single and Double Resonance Microwave Spectroscopy in Superfluid $^4$He   Clusters",
    "url": "https://arxiv.org/abs/physics/9905022"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "9919cdad-6902-4ff3-8bee-cc0cee8133ec",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}