<div>You are still missing the "PERIODIC NONE" in the SUBSYS section:</div><div>https://manual.cp2k.org/trunk/CP2K_INPUT/FORCE_EVAL/SUBSYS/CELL.html#CP2K_INPUT.FORCE_EVAL.SUBSYS.CELL.PERIODIC</div><div><br /></div><div>There is a warning in your output.</div><br /><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Friday, September 5, 2025 at 8:42:47 PM UTC+2 Naina Sethi 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 Prof. Hutter,<div>Is there any mistake in my input setup? Could you please help.<br><div><br></div></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Monday, August 25, 2025 at 3:05:15 PM UTC+5:30 Naina Sethi 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"><p>I am using CP2K version 2024.3 and attempted to reproduce one of the sample calculations on the benzene molecule (<a rel="noopener nofollow" href="https://www.cp2k.org/exercises:2015_ethz_mmm:infra_red" target="_blank" data-saferedirecturl="https://www.google.com/url?hl=en&q=https://www.cp2k.org/exercises:2015_ethz_mmm:infra_red&source=gmail&ust=1757408770510000&usg=AOvVaw0bLI47-mmE1J12uh_ACAJd">https://www.cp2k.org/exercises:2015_ethz_mmm:infra_red<span aria-hidden="true"></span></a>). However, I am unable to obtain force constants similar to those that i get from gaussian. While the vibrational frequencies, IR intensities, and reduced masses agree perfectly with Gaussian results, the force constants differ significantly(specifically for lower frequency regime). This discrepancy is concerning because the magnitude of the force constants is critical for my work. Could you please advise whether this might be related to changes in the code since the example was prepared, or if I might be missing something in my setup?</p><p>I am attaching the Input and output files from CP2K and gaussian calculation. Kindly suggest. </p><p>Thank you very much for your time and guidance.</p><p>Best regards,</p><br></blockquote></div></blockquote></div>
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