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[Konstantin Rushchanskii <Konstantin.Rushchanskii@physik.uni-regensburg.de>]

Dear Bohdan,

>  
> I had right the same problem with another crystal: the calculated
> magnitudes of epsilon' (0 eV) obtained by 'optic' and 'anaddb' were
> very different. Unfortunately, I had no obtained an answer on similar
> question. The value of epsilon' (0 eV) obtained with 'anaddb' seem to
> be right.


May be the answer is, that anaddb takes into account also the phonon
degrees of freedom (and corresponding part of esilon (0eV)), and
utilizing the optic utility you have only electronic contribution to
espilon (0eV)?

Sincerely,
K.Rushchanskii