<div>Dear Harry,</div><div>You have to setup a suitable HF section (see https://manual.cp2k.org/trunk/CP2K_INPUT/FORCE_EVAL/DFT/XC/HF.html). CP2K will not do it by itself except of an available shortcut as stated in the manual (see https://manual.cp2k.org/trunk/CP2K_INPUT/FORCE_EVAL/DFT/XC/XC_FUNCTIONAL.html). Compare the already available xc_sections in the CP2K data directory (https://github.com/cp2k/cp2k/tree/master/data/xc_section) for their setup.</div><div>Best,</div><div>Frederick</div><br /><div class="gmail_quote"><div dir="auto" class="gmail_attr">Harry Richardson schrieb am Donnerstag, 17. April 2025 um 11:15:16 UTC+2:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">i have been suggested to use multiplicity 3, I have tried and does not affect convergence, please see attached. <br><br><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Thursday, April 17, 2025 at 9:36:10 AM UTC+1 Harry Richardson wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>Hi all, I am pretty new to DFT and trying to run some single atom (C) DFT to use as a subtraction when fine tuning a machine learned force field for MD. As such it needs to be run at the same level of theory as my full system calculations. <br></div><div><br></div><div>I just need single point energies. <br></div><div><br></div><div>At the moment it is not converging, I have attached my input and output files, i am using the omega97X-D functional. <br></div><div><br></div><div>Some thing I have tried include: <br></div><div><ul><li>Changing the box from periodic to non periodic</li><li>Reducing mixing</li><li>Increasing & decreasing the size of the box <br></li><li>Changing multiplicity <br></li><li>Reducing cutoff <br></li></ul><div>The energy change per step seems to reduce over steps but does not converge. <br></div><div><br></div><div>I am using the DZVP-MOLOPT basis set and GTH-PBE-q4 potential as suggested in here: <a href="https://www.cp2k.org/exercises:2018_uzh_cmest:faq" rel="nofollow" target="_blank" data-saferedirecturl="https://www.google.com/url?hl=de&q=https://www.cp2k.org/exercises:2018_uzh_cmest:faq&source=gmail&ust=1744973662035000&usg=AOvVaw2FH9O4GScW4kIuR4rrYLx7">https://www.cp2k.org/exercises:2018_uzh_cmest:faq</a> <br></div><div>potentially that is the issue? <br></div><div><br></div><div>Would appreciate any help you can provide <br></div><div><br></div><div>Thanks</div></div></blockquote></div></blockquote></div>
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