<div dir="ltr">Dear Fabian<div><br></div><div>we did not investigate organosilicon systems in particular, but we found that for periodic framework materials in general, the default parameters of GFN1-xTB may in certain cases lead to instabilities. The keyword CHECK_ATOMIC_CHARGES in the xTB section is actually checking for unphysical Mulliken charges; if the keyword is set to true, CP2K stops if the self-consistently obtained Mulliken charges are significantly different from the expected, physically reasonable value.</div><div><br></div><div>Best regards</div><div><br></div><div>Anna</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Am Mi., 22. Juni 2022 um 18:40 Uhr schrieb <a href="mailto:fabbe...@gmail.com">fabbe...@gmail.com</a> <<a href="mailto:fabbeaaren@gmail.com">fabbeaaren@gmail.com</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div>Hello CP2k community,</div><div><br></div><div>I am running some QS simulations using XTB on a sample containing Si, O, C, and H. Following some other threads here I have managed to get the system running reasonably well. However the H closest to Si gain way to much kinetic energy after the 1st time step. <br></div><div><br></div><div>Having found this paper (<a href="https://arxiv.org/pdf/2109.10416.pdf" target="_blank">https://arxiv.org/pdf/2109.10416.pdf</a>) I am wondering if anyone else here has had a problem getting XTB to work for organosilicon systems.</div><div><br></div><div>Best regards</div><div><br></div><div>Fabian <br></div>
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