<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">I am not sure if I understand your question well enough to answer it, but let me make a guess. You want to create a cell with two ions, Na+0.4 and Cl-0.4 where the two ions are well separated so they do not interact, and then calculate the energy (?) or something similar in the standard way.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">Unfortunately I am 99.99% certain [1] that this won't work as you cannot tell the Na to stay +0.4, and the Cl -0.4. Almost certainly the Na states are higher than the Cl, so you will end up with Na +1 and Cl -1. In Wien2k we cannot tell electrons where to go [1].</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">It may be that you want to start a normal calculation with Cl -0.4 and let it go from there -- you will almost certainly need to use a WATSON radius for this (see UG).</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000">[1] N.B., there is a 0.01% chance that a fixed spin-moment calculation with a moment of 0.8 might work. </div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jul 21, 2020 at 10:12 AM Georg Eickerling <<a href="mailto:georg.eickerling@physik.uni-augsburg.de">georg.eickerling@physik.uni-augsburg.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear WIEN2k users,<br>
<br>
I have a somewhat strange question:<br>
<br>
I have read (and tested) the advice in the FAQ concerning charged cells. The<br>
according HowTo leads to a "charged cell SCF" which is not want I want.<br>
<br>
What I want is somewhat simpler, namely a superposition of independent charged<br>
atoms which in sum form a neutral cell, i.e. create a new_super.clmsum of<br>
non-interacting Na+0.4 and Cl-0.4 atoms, for example.<br>
<br>
As described in the FAQ, messing around with the case.inst to create the<br>
cation works, but fails when trying to include the anion in the same way.<br>
<br>
Is there any other trick to do this in Wien2k?<br>
<br>
Thanks in advance and best regards,<br>
<br>
Georg Eickerling<br>
<br>
<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr">Professor Laurence Marks<br>Department of Materials Science and Engineering<br>Northwestern University<br><a href="http://www.numis.northwestern.edu/" target="_blank">www.numis.northwestern.edu</a><div>Corrosion in 4D: <a href="http://www.numis.northwestern.edu/MURI" target="_blank">www.numis.northwestern.edu/MURI</a><br>Co-Editor, Acta Cryst A<br>"Research is to see what everybody else has seen, and to think what nobody else has thought"<br>Albert Szent-Gyorgi</div></div></div>