{
  "annotation_id": "66bc0791-3cdc-4904-b209-0ab631d3d46a",
  "date_created": "2026-03-02T18:00:39.704000Z",
  "date_modified": "2026-03-02T18:00:39.704000Z",
  "file_hash": "0932d63c886f22984b4f09596235b91f22499219abff8d2977be2b4e63e9720a",
  "private": false,
  "record": {
    "abstract": "An exact expression for the cross polarization between two spin-1/2 particles\nis derived from the quantum Liouville equation. This is given in the form of\ntwo integrodifferential equations. These can be solved exactly in the static\ncase (no sample spinning) and a powder average performed numerically. With\nmagic angle spinning, the neglect of certain interference terms simplifies the\nnumerical calculation. A further assumption decoupling the calculation of the\nsidebands gives a very simple formula that is capable of giving a qualitative\ninterpretation of all experimental observations. Examples are given\nillustrating typical buildup curves and CPMAS matching profiles.",
    "arxiv_id": "physics/0203003",
    "authors": [
      "F. Marica",
      "R. F. Snider"
    ],
    "categories": [
      "physics.chem-ph"
    ],
    "title": "An Analytical Formulation of CPMAS",
    "url": "https://arxiv.org/abs/physics/0203003"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "59eedb3b-71fd-455c-91f3-798a758dc27d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}