<div><br /></div>Hi ...<div><br /></div><div>As usual it is recommendable to ensure convergence of the electronic structure problem before starting MD</div><div>if the wave function is badly converged, the resulting forces are so wrong that any further step is meaningless</div><div><br /></div><div>Given the limited knowledge on the system you are running, one can just guess. </div><div>You chose to run SCF with diagonalization and Broyden mixing, but no added mos and smearing, is there a reason?</div><div>OT would be more efficient in this case. If you keep using mixing, decrease the APLHA parameter.</div><div><br /></div><div>Regards</div><div>Marcella</div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Monday, December 18, 2023 at 3:55:14 AM UTC+1 tangzh...@163.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;">Dear everyone, <div>when I was doing the calculation of the movement of sodium ions on graphene, I ran 211 steps, and the SCF did not converge at each step. Is it because I have too many atoms (256)? Or which cut-off parameters are not appropriate? Or do I need to optimize the structure of the model first and then perform the AIMD calculation?<br></div></blockquote></div>
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