<div dir="ltr"><span style="color:rgb(0,0,0);font-size:12.8px">We are focusing on the Ni edges, and want to compare several different compounds so relative positions etc matter. From reading txspec.f it looks as if for O the effect should be small, but I don't see justification for the Ni valence states being used.</span><div style="color:rgb(0,0,0);font-size:12.8px"><br></div><div style="color:rgb(0,0,0);font-size:12.8px">Maybe someone has tested this previously in detail and can respond.</div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Feb 16, 2017 at 7:40 AM, Peter Blaha <span dir="ltr"><<a href="mailto:pblaha@theochem.tuwien.ac.at" target="_blank">pblaha@theochem.tuwien.ac.at</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">If this is O-K edge, then one can keep NE in in2 file constant and<br>
neutralize in mixer (inm).<br>
I think this option is mentioned somewhere for cases when the first<br>
unoccupied states have a very wrong character as supposed from the<br>
dipole selection rule.<br>
<span class=""><br>
Am 16.02.2017 um 00:38 schrieb Laurence Marks:<br>
> Thanks. The postdoc is running cases (NiO supercell) which are not<br>
> completed yet; there are differences but I will wait.What concerns me a<br>
> little is that no matter what type of core hole one uses, the extra<br>
> electron added in case.in2 will go into the minority d unless fsm is used.<br>
><br>
> On Wed, Feb 15, 2017 at 3:56 PM, Peter Blaha<br>
</span><span class="">> <<a href="mailto:pblaha@theochem.tuwien.ac.at">pblaha@theochem.tuwien.ac.at</a> <mailto:<a href="mailto:pblaha@theochem.tuwien.ac.at">pblaha@theochem.<wbr>tuwien.ac.at</a>>> wrote:<br>
><br>
> I do not have real experience with this and I don't think there are<br>
> "global" rules, but one has to consider the specific case.<br>
><br>
> I guess in most cases it does not matter which spin you select for the<br>
> core hole. The important thing is the coulomb potential, which is<br>
> modified due to a missing electron. The exchange effect should be small.<br>
><br>
> I could imagine (without real experience) that this could be important<br>
> for more localized cases like in 3d or in particular 4f elements,<br>
> because the 4f valence electrons are spatially in a similar region as a<br>
> higher core electron and thus direct exchange effects can happen.<br>
><br>
> In any case, typically XAS of localized 3d or 4f electron systems is not<br>
> well described by the simple core-hole approach, since multiplet effects<br>
> dominate the L2,3 or M4,5 spectra.<br>
><br>
> PS: Did you really see a spin change depending on a up/dn or<br>
> "non-magnetic" hole ?<br>
><br>
> Am 15.02.2017 um 17:41 schrieb Laurence Marks:<br>
> > Also...there might be a deeper problem since if one uses an "up" core<br>
> > hole, unless FSM is used the final state can have a spin change.<br>
> ><br>
> > On Tue, Feb 14, 2017 at 4:24 PM, Laurence Marks<br>
> > <<a href="mailto:L-marks@northwestern.edu">L-marks@northwestern.edu</a> <mailto:<a href="mailto:L-marks@northwestern.edu">L-marks@northwestern.<wbr>edu</a>><br>
</span>> <mailto:<a href="mailto:L-marks@northwestern.edu">L-marks@northwestern.<wbr>edu</a> <mailto:<a href="mailto:L-marks@northwestern.edu">L-marks@northwestern.<wbr>edu</a>>>><br>
<span class="">> wrote:<br>
> ><br>
> > I think there is a slightly ambiguity for spin-polarized cases in<br>
> > the UG. I don't see mention that one has to carefully setup<br>
> > case.incup/case.incdn for the core hole (or fractional hole). From<br>
> > what I can see it does not seem like this is an issue in the later<br>
> > calculations, but I think it is easy for someone to inadvertantly<br>
> > calculate a spin-unresolved for for a spin case.<br>
> ><br>
> > N.B., for my own sanity, it would be nice if someone could confirm<br>
> > that xtelnes/xspec don't really care about the occupancies in<br>
> > case.inc, just an adequate list of states.<br>
> ><br>
> > --<br>
> > Professor Laurence Marks</span></blockquote></div><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><span style="font-size:12.8px">Professor Laurence Marks</span><br></div><div dir="ltr"><span style="font-size:12.8px">"Research is to see what everybody else has seen, and to think what nobody else has thought", </span><span style="font-size:12.8px">Albert Szent-Gyorgi</span><br><a href="http://www.numis.northwestern.edu" target="_blank">www.numis.northwestern.edu</a> ; <span style="font-size:12.8px">Corrosion in 4D: </span><a href="http://MURI4D.numis.northwestern.edu" style="font-size:12.8px" target="_blank">MURI4D.numis.northwestern.edu</a><div><span style="font-size:12.8px">Partner of the CFW 100% program for gender equity, </span><a href="http://www.cfw.org/100-percent" style="font-size:12.8px" target="_blank">www.cfw.org/100-percent</a></div><div>Co-Editor, Acta Cryst A</div></div></div></div></div></div></div></div></div></div></div>
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