{
  "ran": "2026-10-14T23:31:44.197Z",
  "how": "tools/runs/smoke-spread.mjs with kit/photochamber.mjs: the same Mie toy as on the page, mass 1 mg/m³, receiver window ±10°, log-normal size spread around the median. Ratios of light reaching the receiver at the same mass.",
  "sources": {
    "spread": "Urban et al., Particle Morphology and Size Results from the Smoke Aerosol Measurement Experiment-2, AIAA 2012-3536 (NASA Glenn and NIST): \"geometric standard deviations of 1.6 – 1.9\"."
  },
  "assumptions": {
    "wavelength_m": 8.8e-7,
    "refractive": {
      "soot": "1.57 + 0.56i",
      "smoke": "1.5"
    },
    "density_kg_m3": 1000,
    "mass_kg_m3": 0.000001
  },
  "bySigma": {
    "1.4": {
      "smokeToSoot": {
        "30": {
          "0.3um": 12.7,
          "0.5um": 30.03,
          "1um": 21.18
        },
        "60": {
          "0.3um": 7.811,
          "0.5um": 9.293,
          "1um": 4.927
        },
        "90": {
          "0.3um": 3.616,
          "0.5um": 3.406,
          "1um": 2.182
        },
        "120": {
          "0.3um": 1.586,
          "0.5um": 1.681,
          "1um": 1.291
        },
        "150": {
          "0.3um": 1.193,
          "0.5um": 1.224,
          "1um": 1.986
        }
      },
      "paleToPale01": {
        "30": 49.8,
        "60": 11.59,
        "90": 5.133,
        "120": 3.035,
        "150": 4.668
      },
      "soot1ToSoot01": {
        "30": 7.344,
        "60": 0.8293,
        "90": 0.4586,
        "120": 0.3035,
        "150": 0.2122
      },
      "ionDrop": {
        "soot01": 0.09115,
        "smoke1": 0.001002
      }
    },
    "1.6": {
      "smokeToSoot": {
        "30": {
          "0.3um": 9.041,
          "0.5um": 11.49,
          "1um": 5.071
        },
        "60": {
          "0.3um": 3.623,
          "0.5um": 3.117,
          "1um": 1.586
        },
        "90": {
          "0.3um": 1.696,
          "0.5um": 1.446,
          "1um": 0.8466
        },
        "120": {
          "0.3um": 0.9283,
          "0.5um": 0.9262,
          "1um": 0.5781
        },
        "150": {
          "0.3um": 0.6887,
          "0.5um": 0.8983,
          "1um": 1.019
        }
      },
      "paleToPale01": {
        "30": 9.919,
        "60": 3.097,
        "90": 1.657,
        "120": 1.131,
        "150": 1.984
      },
      "soot1ToSoot01": {
        "30": 1.776,
        "60": 0.2569,
        "90": 0.1664,
        "120": 0.1296,
        "150": 0.09709
      },
      "ionDrop": {
        "soot01": 0.06407,
        "smoke1": 0.0006841
      }
    },
    "1.9": {
      "smokeToSoot": {
        "30": {
          "0.3um": 3.941,
          "0.5um": 2.629,
          "1um": 1.04
        },
        "60": {
          "0.3um": 1.463,
          "0.5um": 0.9842,
          "1um": 0.4311
        },
        "90": {
          "0.3um": 1,
          "0.5um": 0.6298,
          "1um": 0.3145
        },
        "120": {
          "0.3um": 0.8018,
          "0.5um": 0.6277,
          "1um": 0.2422
        },
        "150": {
          "0.3um": 0.7857,
          "0.5um": 1.176,
          "1um": 0.6354
        }
      },
      "paleToPale01": {
        "30": 1.138,
        "60": 0.464,
        "90": 0.4006,
        "120": 0.3958,
        "150": 1.012
      },
      "soot1ToSoot01": {
        "30": 0.3234,
        "60": 0.0717,
        "90": 0.06866,
        "120": 0.07414,
        "150": 0.0714
      },
      "ionDrop": {
        "soot01": 0.03498,
        "smoke1": 0.0003623
      }
    }
  }
}