Hi Kuntal,<div><br /></div><div>It looks like this is still the case in the latest CP2K version. I see no reason why it should not be possible to implement it, but I don't think anybody is currently developing the CDFT implementation in CP2K. </div><div><br /></div><div>If you just want to calculate the electronic coupling then a fragment constraint is probably not necessary.</div><div><br /></div><div>https://github.com/cp2k/cp2k/blob/master/src/qs_cdft_methods.F<br /></div><div>CASE (cdft_alpha_constraint, cdft_beta_constraint)<br /> CALL cp_abort(__LOCATION__, &<br /> "CDFT fragment constraint not yet compatible with "// &<br /> "spin specific constraints.")<br /></div><div><br /></div><div>Best wishes,</div><div>Chris </div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Tuesday, 4 July 2023 at 19:07:14 UTC+1 Kuntal Ghosh 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;">Hi,<div><br></div><div>I am trying to carry out Constrained DFT calculations for a chloride radical transfer reaction between tert-butyl hypochlorite and a benzyl radical. Part of this requires mixed CDFT calculations, with spin specific constraints.</div><div><br></div><div>Here, I'm using </div><div><br></div><div>TYPE_OF_CONSTRAINT BECKE (in the &CDFT section)<br></div><div>CONSTRAINT_TYPE ALPHA (in the &ATOM_GROUP section)</div><div><br></div><div><div>However, I get the following error message :</div><div><br></div><div>"CDFT fragment constraint not yet compatible with spin specific constraints"</div><br></div><div>I'm using CP2K version 7.0 (Development Version). Can anyone please let me know if there is any version of CP2K that fully supports spin specific constraint calculations in CDFT?</div><div><br></div><div>Thanks!</div><div>Kuntal</div><div><br></div></blockquote></div>
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