Is it possible to find the dielectric function for material from its UV or reflectance?
* The real part of the dielectric function is calculated as n^2 - k^2.
* The imaginary part as 2*n*k.
* The refractive index n and extinction coefficient are typically determined using ellipsometry.
* On the refractive index database (https://refractiveindex.info/), you can find n,k for a large collection of compounds.
* Also, check out the Adachi handbook.
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