we have synthesized a novel semiconductor compound experimentally and found the permittivity through UV (beer's Lambert law). Is there any way I can separate the real and imaginary part of that permittivity?
If you employ the Beer-Lambert law you only get the imaginary part of the index of refraction. You can obtain the real part by using the Kramers-Kronig relations. If your semiconductor is of cubic symmetry, however, it is of course easy to convert the index of refraction into the permittivity. I would, however, strongly advise against the use of the Beer-Lambert law for reasons that are explained in the linked paper. A much better way to determine the permittivity would e.g. be spectroscopic ellipsometry.
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