ri_ammonium_sulfate
Constants
Ammonium sulfate aerosol ("(NH4)2SO4") complex refractive index m = n + i k, wavelength in nm. Assumptions: dry crystalline aerosol surrogate for continental haze; ~300 K; morphology not modeled. Guidance/sources (composite, smoothed for Mie with linear interpolation):
- Toon, Pollack & Khare (1976); d'Almeida et al. (1991); Hess et al. (1998, OPAC) — visible/NIR anchors (n≈1.52, k≈0).
- Palmer & Williams (1975) optical constants compendium; Querry (1985/1991) — UV and MIR/LWIR band behavior. Notes:
- In the visible, k is extremely small (≈1e-6–1e-5). We use small nonzero values to avoid divide-by-zero corner cases.
- MIR bands associated with sulfate and ammonium groups raise k around ~3 µm (weak) and ~7–10 µm (stronger).
- Coverage: 200–20,000 nm; denser sampling near MIR bands.
Functions
🌫️ Ammonium sulfate (continental haze surrogate)
AMMONIUM_SULFATE_REFRACTION_INDEX_LUT
Ammonium sulfate aerosol ("(NH4)2SO4") complex refractive index m = n + i k, wavelength in nm. Assumptions: dry crystalline aerosol surrogate for continental haze; ~300 K; morphology not modeled. Guidance/sources (composite, smoothed for Mie with linear interpolation):
- Toon, Pollack & Khare (1976); d'Almeida et al. (1991); Hess et al. (1998, OPAC) — visible/NIR anchors (n≈1.52, k≈0).
- Palmer & Williams (1975) optical constants compendium; Querry (1985/1991) — UV and MIR/LWIR band behavior. Notes:
- In the visible, k is extremely small (≈1e-6–1e-5). We use small nonzero values to avoid divide-by-zero corner cases.
- MIR bands associated with sulfate and ammonium groups raise k around ~3 µm (weak) and ~7–10 µm (stronger).
- Coverage: 200–20,000 nm; denser sampling near MIR bands.
Kind: global constant
ri_ammonium_sulfate(result, wavelength_nm)
🌫️ Ammonium sulfate (continental haze surrogate)
Kind: global function
| Param | Type | Description |
|---|---|---|
| result | Array.<number> | complex number, refraction index |
| wavelength_nm | number | in nanometers |