{
  "annotation_id": "aa28b48c-df49-40f8-93c8-04b987c54875",
  "date_created": "2026-03-02T18:01:03.865000Z",
  "date_modified": "2026-03-02T18:01:03.865000Z",
  "file_hash": "65927a85c897bcadf037efacfca834081bad028f478a568d365a9c6722349e75",
  "private": false,
  "record": {
    "abstract": "Carbonado-diamond is the most enigmatic of diamond types, and surprisingly\nthere are few optical studies. In some cases, the diamond peak at 1332.5 cm-1\nis absent, and the presence of a D-band graphite peak around 1320 cm-1 is\nobserved in our Raman investigation. The disappearance of the diamond peak in\ncarbonado-diamond is interpreted as the combined effect of small crystal size\nand the high absorption of graphite. The photoluminescence spectra of\ncarbonado-diamond shows two new zero phonon lines at 584.2 nm (2.12 eV) and at\n743 nm (1.67 eV). By heating the carbonado-diamond to 1500 oC for ten minutes\nin argon the appearance of an additional peak at 693.5 nm (1.786 eV) is\ndetected. The infrared absorption spectra of carbonado-diamond powder indicate\neither extremely low or extremely high absorption.",
    "arxiv_id": "physics/0601136",
    "authors": [
      "Jozsef Garai",
      "Stephen E. Haggerty",
      "Andriy Durygin"
    ],
    "categories": [
      "physics.geo-ph",
      "physics.optics"
    ],
    "title": "Investigating the optical properties of carbonado-diamonds",
    "url": "https://arxiv.org/abs/physics/0601136"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4ab1de8f-d27b-4e07-8122-77bcf30951c9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}