Dear CP2K community,<div>I am running a molecular dynamics simulation for a system containing an ion and triphosphate.</div><div>I need to avoid the center of mass of triphosphate to go further than 6.5 A away from the ion, but I need to sample lower intermolecular distances. </div><div><br></div><div>I would apply an half-harmonic potential centered around 6 A and growing for larger distances. Unfortunately, I have found only harmonic potentials for constraining collective variables ( https://manual.cp2k.org/trunk/CP2K_INPUT/MOTION/CONSTRAINT/COLLECTIVE/RESTRAINT.html)</div><div>, which would prevent sampling of distances lower than 6 A.</div><div><br></div><div>I would be very grateful if you could suggest me any solutions for my problem.</div><div>Thank you in advance.</div><div><br></div><div>Best regards,</div><div>Emma Rossi</div><div><br></div><div><br></div><div><br></div>
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