<div>Hello Dr.Krack,</div><div>thank you for you quick answer, for the book , is this specific topic treated in the chapter 2 : 2.5 Spin-Adapted Configurations ?</div><div><br></div><div>best,</div><div><br></div><div>Mario.<br></div><br><div class="gmail_quote"><div dir="auto" class="gmail_attr">Le mardi 28 juin 2022 à 15:09:29 UTC+2, Matthias Krack a écrit :<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div lang="en-CH" link="blue" vlink="purple" style="word-wrap:break-word"> <div> <p class="MsoNormal"><span lang="DE-CH">Hello Mario<u></u><u></u></span></p> <p class="MsoNormal"><span lang="DE-CH"><u></u> <u></u></span></p> <p class="MsoNormal"><span lang="EN-US">UKS (alias LSD) is the first choice for systems with an odd number of electrons or if an overall multiplicity greater than one is required. ROKS is special and not all feature available with UKS are also implemented with ROKS. ROKS employs only one set of spatial orbitals which can be either doubly or singly occupied (or empty, of course) whereas UKS works with two sets of singly occupied spin orbitals, alpha and beta, i.e. ROKS implies compared to UKS a constraint concerning the spatial wavefunctions. You can find further details in any quantum chemistry textbook like the Szabo and Ostlund.<u></u><u></u></span></p> <p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p> <p class="MsoNormal"><span lang="EN-US">HTH<u></u><u></u></span></p> <p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p> <p class="MsoNormal"><span lang="EN-US">Matthias<u></u><u></u></span></p></div></div><div lang="en-CH" link="blue" vlink="purple" style="word-wrap:break-word"><div> <p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p> <div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm 0cm"> <p class="MsoNormal" style="margin-left:36.0pt"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">"<a href data-email-masked rel="nofollow">cp...@googlegroups.com</a>" <<a href data-email-masked rel="nofollow">cp...@googlegroups.com</a>> on behalf of Moser Mario <<a href data-email-masked rel="nofollow">moser...@gmail.com</a>><br> <b>Reply to: </b>"<a href data-email-masked rel="nofollow">cp...@googlegroups.com</a>" <<a href data-email-masked rel="nofollow">cp...@googlegroups.com</a>><br> <b>Date: </b>Tuesday, 28 June 2022 at 12:42<br> <b>To: </b>"<a href data-email-masked rel="nofollow">cp...@googlegroups.com</a>" <<a href data-email-masked rel="nofollow">cp...@googlegroups.com</a>><br> <b>Subject: </b>[CP2K:17240] input parameter choice<u></u><u></u></span></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt"><u></u> <u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt">Hello,<u></u><u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt">i managed to install gromacs/cp2k and was able to simulate some systems, im still quite new to it and i had a few question about some parameters you can chose in input file. <u></u><u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt"><u></u> <u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt">I simulated a system with Zn2+ with an histidine and in the &OT section i had only MINIMIZER, STEPSIZE and PRECONDITIONNER FULL_ALL.<u></u><u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt">(in gromacs cp2k the input file is generated automaticly with the mdp file but you can modify the cp2k.inp file and provided any inp file you want)<u></u><u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt"><u></u> <u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt">Then i wanted to simulate the exact same system but with Cu2+ instead of Zn2+, this time in the &OT section i had UKS that appeared, i looked in manual and UKS is using alpha and beta orbitals for spin polarized calculations and ROKS is using a restricted Kohn-sham calculation.<u></u><u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt"><u></u> <u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt">I got advised to put ROKS instead of UKS, is this because Cu2+ has an unpaired electron in orbital d (3d9) so we need to change multiplicity to 2 and restrict the DFT calculation ? (compared to Zn2+ who has no unpaired electron so multiplicity is set to 1)<u></u><u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt"><u></u> <u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt">Is there a more detailed version of the online manual that i missed or a book that could explain the parameters ?<u></u><u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt"><u></u> <u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt"><u></u> <u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt">Best regards,<u></u><u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt"><u></u> <u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt">Mario<u></u><u></u></p> </div> <div> <p class="MsoNormal" style="margin-left:36.0pt"><u></u> <u></u></p> </div> </div></div><div lang="en-CH" link="blue" vlink="purple" style="word-wrap:break-word"><div><p class="MsoNormal" style="margin-left:36.0pt">-- <br> You received this message because you are subscribed to the Google Groups "cp2k" group.<br> To unsubscribe from this group and stop receiving emails from it, send an email to <a href data-email-masked rel="nofollow">cp2k+uns...@googlegroups.com</a>.<br> To view this discussion on the web visit <a href="https://groups.google.com/d/msgid/cp2k/86da1348-5df4-408d-8a66-70b036eb7313n%40googlegroups.com?utm_medium=email&utm_source=footer" target="_blank" rel="nofollow" data-saferedirecturl="https://www.google.com/url?hl=fr&q=https://groups.google.com/d/msgid/cp2k/86da1348-5df4-408d-8a66-70b036eb7313n%2540googlegroups.com?utm_medium%3Demail%26utm_source%3Dfooter&source=gmail&ust=1656592890460000&usg=AOvVaw0dVs2riGJzpEnsHCTSIAvL"> https://groups.google.com/d/msgid/cp2k/86da1348-5df4-408d-8a66-70b036eb7313n%40googlegroups.com</a>.<br> <br> <u></u><u></u></p> </div> </div> </blockquote></div> <p></p> -- <br /> You received this message because you are subscribed to the Google Groups "cp2k" group.<br /> To unsubscribe from this group and stop receiving emails from it, send an email to <a href="mailto:cp2k+unsubscribe@googlegroups.com">cp2k+unsubscribe@googlegroups.com</a>.<br /> To view this discussion on the web visit <a href="https://groups.google.com/d/msgid/cp2k/29fd1bbe-a01d-45a2-8af6-2847f7330486n%40googlegroups.com?utm_medium=email&utm_source=footer">https://groups.google.com/d/msgid/cp2k/29fd1bbe-a01d-45a2-8af6-2847f7330486n%40googlegroups.com</a>.<br />