<div dir="ltr"><div>Hello Michela, CC: Forum</div><div><br></div><div> Please have a look on the <a href="https://manual.cp2k.org/cp2k-2024_1-branch/CP2K_INPUT/FORCE_EVAL/DFT/XC/VDW_POTENTIAL/PAIR_POTENTIAL.html">https://manual.cp2k.org/cp2k-2024_1-branch/CP2K_INPUT/FORCE_EVAL/DFT/XC/VDW_POTENTIAL/PAIR_POTENTIAL.html</a> instead (the section on &PAIR_POTENTIAL goes into the section &XC, not &ATOM).</div><div><br></div><div> Another issue, you exclude the periodicity in the third direction (&POISSON / PERIODIC XY); is that a valid assumption, that the molecules would not desorb from the "slab" at such high a temperature?</div><div><br></div><div> Greetings from Paris,</div><div><br></div><div> apsi</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">Le jeu. 13 févr. 2025 à 15:08, Michela Benazzi <<a href="mailto:bnzmichela@gmail.com">bnzmichela@gmail.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>Hello everyone,</div><div><br></div><div>I have posted here before about my simulations involving liquid metal + CO2. I realized that my extremely high T, P were arising once I added CO2 instead of vacuum on top of a previously converged 2D periodic slab of liquid metal.</div><div><br></div><div>I am now trying to run DFT on CO2 alone at 1200 K. I attached the files I used before and after adding the Grimme D3 correction: I thought it would "fix it" by accounting for long-range vdW forces that I was not accounting for before, but nothing has changed. Is there anything else I am missing?<br><br>I have gotten comments before on how my initial CO2 system is too ordered (I generate it with Python): I am just curious about how others prepare an initial gas structure before using DFT to get optimized geometry. Should I run GEO_OPT first?</div><div><br></div><div>Is that even the main problem with my work?<br><br>Thank you so much! Best,</div><div><br></div><div>Michela</div>
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</blockquote></div><div><br clear="all"></div><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-=*=-<br> Ari Paavo Seitsonen / <a href="mailto:Ari.P.Seitsonen@iki.fi" target="_blank">Ari.P.Seitsonen@iki.fi</a> / <a href="http://www.iki.fi/~apsi/" target="_blank">http://www.iki.fi/~apsi/</a><br> Ecole Normale Supérieure (ENS), Département de Chimie, Paris<br> Mobile (F) : +33 789 37 24 25 (CH) : +41 79 71 90 935<br></div></div></div></div></div></div>
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