<div dir="ltr"><div>Some time ago there was a project of variable-cell NEB, but it went nowhere. Anyway: here the problem is not variable-cell NEB but a NEB between an initial configuration in the ground state and a final one in the excited state, if I understand correctly. This is just plain impossible.</div><div><br></div><div>Paolo<br></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Sep 6, 2019 at 11:21 AM Giuseppe Mattioli <<a href="mailto:giuseppe.mattioli@ism.cnr.it">giuseppe.mattioli@ism.cnr.it</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"><br>
Dear Apoorv Jain<br>
<br>
AFAIK, variable cell NEB is not implemented in QE (yet).<br>
HTH<br>
Giuseppe<br>
<br>
"A. Jain" <<a href="mailto:aj520@cam.ac.uk" target="_blank">aj520@cam.ac.uk</a>> ha scritto:<br>
<br>
> Hi All,<br>
><br>
> I would like to conduct an neb study on my system (ruthenium based <br>
> crystals) where photoisomerisation takes place. We would like to <br>
> investigate the mechanism of photoisomerisation. However the ground <br>
> state and irradiated states (geometries obtained via accurate xrd <br>
> experiments) have very slightly different cell parameters due to the <br>
> magnitude of the photoisomerisation.<br>
><br>
> The Ground State values are :Axis (Ang): A=8.3891, B=12.5019, <br>
> C=13.1614. Angles (deg): a=99.481, b=98.613, c=90.27.<br>
> Excited state: Axis (Ang): A=8.4845, B=12.4241, C=13.3243. Angles <br>
> (deg): a=101.456, b=98.732, c=91.001.<br>
> As you can see the values effectively only change by 1%.<br>
><br>
> So I would like to know if is it possible to conduct neb on images <br>
> whose cell parameters also change, ie I would use the ground state <br>
> as the starting image and the excited state as the final image? I <br>
> expect the answer is no. If not, has anybody come across a similar <br>
> problem or has any suggestions for how I could approach this issue?<br>
><br>
> Thank you for your help.<br>
><br>
> Apoorv Jain (PhD Student)<br>
> Department of Physics, University of Cambridge<br>
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<br>
<br>
<br>
GIUSEPPE MATTIOLI<br>
CNR - ISTITUTO DI STRUTTURA DELLA MATERIA<br>
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I-00015 - Monterotondo Scalo (RM)<br>
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E-mail: <<a href="mailto:giuseppe.mattioli@ism.cnr.it" target="_blank">giuseppe.mattioli@ism.cnr.it</a>><br>
<br>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,<br>Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>Phone +39-0432-558216, fax +39-0432-558222<br><br></div></div></div></div></div>