Hello,<div>the alkaline metals can require a very large cutoff to get accurate forces due to extremely tightly confined semivalence s electrons.</div><div>You might want to try using the GAPW method in the QS section to evaluate the semicore functions on an atom centred grid.</div><div>Matt<br><br></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Wednesday, 12 October 2022 at 16:32:52 UTC+1 eric.ledi...@gmail.com 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>Dear CP2K community</div><div><br></div><div>I am unsure of what I am doing wrong, but a previously working system suddenly buckled when I introduced NaOH. that is to say, the Na atom flies off at high speed while all other atoms remain mostly frozen in place. in the images below, the large orange balls are Cl and the small one by the OH is Na.<br></div><div> <img alt="Screenshot from 2022-10-12 10-28-09.png" width="332px" height="340px" src="https://groups.google.com/group/cp2k/attach/957d4a11a951a/Screenshot%20from%202022-10-12%2010-28-09.png?part=0.2&view=1"> <img alt="Screenshot from 2022-10-12 10-29-02.png" width="337px" height="357px" src="https://groups.google.com/group/cp2k/attach/957d4a11a951a/Screenshot%20from%202022-10-12%2010-29-02.png?part=0.1&view=1"></div><div>Am I using the wrong kind of potential? structure issues? something else? I need a direction to search in at least. thank you so much for your time.</div><div><br></div><div>with best wishes,</div><div>Eric Ledieu<br></div></blockquote></div>
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