<div dir="ltr"><p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:Arial,sans-serif;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">Dear
All,</span><span style="font-size:12pt;font-family:"Times New Roman",serif"></span></p>

<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:Arial,sans-serif">I want to calculate
ionic contributions to the frequency-dependent dielectric function. I
know there are several options available in QE for calculating eps_inf and
eps_0 constants but I'm not sure of frequency dependency calculation for the
ionic part. Essentially, I want a similar calculation as given in the link below (using the VASP)</span></p>

<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:Arial,sans-serif"> </span></p>

<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:Arial,sans-serif"><a href="https://www.vasp.at/wiki/index.php/Ionic_contributions_to_the_frequency_dependent_dielectric_function_of_NaCl" style="color:rgb(5,99,193)">https://www.vasp.at/wiki/index.php/Ionic_contributions_to_the_frequency_dependent_dielectric_function_of_NaCl</a></span></p>

<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:Arial,sans-serif"> </span></p>

<p class="MsoNormal" style="margin:0in 0in 0.0001pt;line-height:normal;font-size:11pt;font-family:Calibri,sans-serif"><span style="font-size:12pt;font-family:Arial,sans-serif">Any help/suggestion is
highly appreciated.</span></p><div><br></div><div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><span><font face="georgia, serif"><div><span style="color:rgb(0,0,0);white-space:pre-wrap">Rajender Tiwari, Ph.D.</span><br></div><div><span style="white-space:pre-wrap;color:rgb(34,34,34)"><font color="#000000"><font size="2">Asia Pacific Center for Theoretical Physics (APCTP)</font></font></span></div><div><span style="white-space:pre-wrap;color:rgb(34,34,34)"><font color="#000000"><font size="2">Hogil Kim Memorial Building #530, POSTECH, </font></font>South Korea</span></div></font></span></div></div></div></div></div>