is there any specific equation to calculate the linear refractive index at different wavelengths of the liquid sample from the UV-Vis spectrum? thank you
If you determine the absorbance spectrum, you could use Beer's law to determine the absorbtion index, i.e. the imaginary part of the complex refractive index, and use the Kramers-Kronig relations to calculate the real part.
The application of the Kramers-Kronig relations is too difficult for real calculations. The Sellmeier relation is more pactical. However you should know (or find in literature) the Sellmeier coefficients for your type of liquid or similar one. The necessary corrections can be made if you have any additional experimental data e.g. the refractive index at one or several wavelengths.
Oh, good to know that something one of my programs does a hundred times per hour is too complicated to do... ;-) Concerning using the Sellmeier equation, how many coefficients would you need in a spectral regions with absorption and how accurate would this be? I guess I stay with a KKR analysis...
Using the limited absorption spectrum (UV-VIS) the insignificant local changes of the refractive index dispersion curve can be calculated only. Or you can calculate the absolute RI from the limited spectrum?
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