<div dir="ltr"><div>Dear QE users and developers,</div><div><br></div><div>Can please someone explain to me how initial path length is being calculated? Or point where it is done in the source code?</div><div><br></div><div><br></div><div>Say, we have A-B molecule where A and B are its subparts (first image). <br></div><div>NEB1: <br></div><div>- B is rotated by +90 degrees about the axis that goes through the A-B bond (intermediate image)</div><div>- B is rotated by +90 degrees more (last image)<br></div><div>NEB2:</div><div>- A is rotated by -90 and B is rotated by +90 degrees (last image).</div><div><br></div><div>For balanced motion, NEB2 is more reasonable choice, and indeed its initial (as well as optimized) path length is smaller than that for NEB1 (number of images are equal). I would be happy to understand from the mathematical perspective why initial path length differs for NEB1 and NEB2.</div><div><br></div><div>Thank you!<br></div><div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Best wishes,</div><div>Alex (<span style="border-collapse:separate;line-height:normal;text-align:-webkit-auto;text-indent:0px;border-spacing:0px"><span style="text-align:-webkit-auto">she/her/hers),</span></span></div><div>phd candidate in chemical sciences<br>'I.. a universe of atoms, an atom in the universe' (Richard P. Feynman)<br><a href="https://cpms.kaust.edu.sa/" target="_blank">https://cpms.kaust.edu.sa/</a></div></div></div></div></div>
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