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<p>Dear Atefe Marasi,</p>
<p>Infinite epsilon means that you extrapolate the epsilon value for
the zero of energy. <br>
</p>
<p>You must plot the real part of the dielectric function to
properly estimate this value. <br>
</p>
<p>You must be careful because if you have a band gap and a bad
description of the gap value ... the estimation will be not good
at all. <br>
</p>
<p>Regards</p>
<p>Xavier<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 29/11/2021 11:38, Atefe Marasi
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CALX4KtJhRk5yDfxP5ADifnKMp8jNMi05YZwdBx9=qOCXnC4Adw@mail.gmail.com">
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<div style="height:81px">Hello dear WIEN2k users,</div>
<div style="height:81px" dir="auto">I am interested in finding
the exact value of infinite epsilon, i.e., dielectric
constant at high frequency. As you know, as frequency goes
to infinity, the value of epsilon asymptotically approaches
to unity. But data reported in literatures for the infinite
epsilon are not equal to one! How can I choose a correct
energy range or frequency to obtain the appropriate infinite
epsilon?</div>
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<div dir="auto">Is there any way to find the
infinite epsilon by WIEN2k?</div>
<div dir="auto"><br>
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<div dir="auto">Thank you,</div>
<div dir="auto">Best Regards,</div>
<div dir="auto">Atefe Marasi</div>
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