Hi there. So, I've been doing a few geometry optimizations and I have seen that for some of them, the cell vectors change, sometimes a bit other times a lot. This especially happens when the SCF run is not converged multiple times in a row. The thing is, I don't want the cell vectors to change, I don't want the atoms to go outside of the box, yet it still happens. Can you give me any tips/ideas on how to do a geometry optimizations where atomic positions can only change and the cell geometry cannot, or is this not feasible?<div><br></div><div>Kind regards,</div><div>Lenard</div>
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