{
  "source": "https://www.exomol.com/data/molecules/C2/12C2/8states/",
  "dataset_doi": "https://doi.org/10.5281/zenodo.5716930",
  "isotopologue": "12C2",
  "electronic_system": "d(3PIg) -> a(3PIu) Swan",
  "line_count_with_centers_359_831_nm": 705293,
  "wavelength_unit": "vacuum nm",
  "sigma_unit": null,
  "temperature_unit": "K",
  "grid_step_nm": 0.1,
  "cell_edges": "center +/-0.05nm clipped to360..830; endpoint cells half-width",
  "averaging": "Generate normalized Doppler opacity on 0.002 nm cells, then exp(-column*sigma), then wavelength-average transmitted fraction to 0.1 nm cells.",
  "intensity_formula": "A_ul*g_u*exp(-c2*E_l/T)*(1-exp(-c2*nu/T))/(8*pi*c*nu^2*Q(T))",
  "profile": "normalized Gaussian Doppler; mass 24 u; no turbulent, pressure or display broadening",
  "natural_width": "omitted; see strength-weighted comparison in validation",
  "pressure_width": "not modeled; ExoMol reports zero pressure-broadener datasets; generic defaults not used",
  "density_shift": "not applied in this table; shift wavenumber separately if used, with source and assumptions",
  "normalization": "absolute LTE strengths; no peak or per-temperature renormalization",
  "limitations": [
    "No C2-He collision width; only thermal broadening.",
    "Density shifts must be applied separately; this is not a complete stellar atmosphere.",
    "Residual sub-0.002 nm saturation discretization; tested .002 vs .001 nm max delta u-v 0.000267 at the prior 9 test cases.",
    "Bilinear temperature/column interpolation; tested midpoints documented in transmission-validation.json.",
    "Multiplying this binned transmission by sharply varying atomic opacity neglects sub-bin covariance."
  ],
  "files": {
    "12C2__8states.pf": {
      "sha256": "f71f6f4b4be4fc8ce64dc11148d640737d01122d7197a33e0d37225968b108f2",
      "bytes": 250000
    },
    "12C2__8states.states.bz2": {
      "sha256": "d63229ec3639301f7682c4f1aaea15271c540eaad0bab094d243add57b71e858",
      "bytes": 919242
    },
    "12C2__8states.trans.bz2": {
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      "bytes": 72033348
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  },
  "quantity": "dimensionless mean transmitted fraction",
  "shape": "transmission[temperature_index][amount_index][wavelength_index]",
  "amount_unit": "1e17 C2 molecules per cm2",
  "validation_max_binning_delta_uv": 5.352645753875358e-07,
  "validation_max_midpoint_delta_uv": 0.00020230367656343682
}