Estimation of visible, near-, and mid-infrared complex refractive indices of calcite, dolomite, and magnesite

1Ted L.Roush
Icarsu (in Press) Link to Article [https://doi.org/10.1016/j.icarus.2020.114056]
1Space Sciences Division, NASA Ames Research Center, Planetary Systems Branch, MS 245-3, Moffett Field, CA 94035-1000, United States of America
Copyright Elsevier

The visible, near-, and mid-infrared (≈0.4–6 μm) imaginary indices of refraction (k) are estimated from reflectance spectra for three carbonates germane to martian and terrestrial studies. The resulting values are combined with previous data at longer wavelengths and a subtractive Kramers-Konig analysis is used to estimate the real indices of refraction (n) as a function of wavelength. This process is iterated until neither the n or k vary significantly. The results provide estimated complex refractive indices spanning the ≈0.4–400 μm. The estimated visible, near-, and mid-infrared carbonate complex refractive indices are broadly consistent with previous studies, but extend the wavelength coverage and improve the spectral resolution for these materials.

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