Tool for calculating IR complex refractive index

This tool uses the source code from NKABS Python package for calculating the complex refractive index of astrophysical ices from the absorbance spectrum. The methodology adopted in this code is detailed in Rocha & Pilling (2014). The input parameters are the absorbance spectrum with the wavenumber (cm^-1) the thickness of the ice (d), the refractive index of the ice at 670 nm (n₀), the refractive index of the substrate (n₂) and the Mean Average Percentual Error (MAPE) as the stop criteria. The outputs of the code are the real (n) and imaginary (k) part of the refractive index with the wavelength.