<div dir="ltr">Hi<div><br></div><div>It's not 100% true that you don't have to care about BSSE in plane-wave codes. If you perform a cell optimisation using plane-wave codes, the number of plane waves may change as your cell volume increases or decreases. I know there are plane wave codes (e.g. CASTEP) which provide option to do finite basis set corrections.</div><div><br></div><div>For CP2K which uses localised basis sets, BSSE due to basis set incompleteness is always there, but depending on which basis sets you're using, what systems you're looking at (bulk or surface or isolated molecules), and which properties you are interested in, BSSE may be strong or can be neglected. BSSEs are usually non-negligible in binding energy calculations, especially if you use moderate basis sets like DZVP-MOLOPT-SR-GTH.</div><div><br></div><div>SL</div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 8 February 2017 at 09:57, David T <span dir="ltr"><<a href="mailto:amazing...@gmail.com" target="_blank">amazing...@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Dear all<br>Apologies if my question is silly but I prefer sound fool and doing things right than make a fool mistake.<br><br>I need to calculate some MCO bond energy in a 3D periodic system.<br><br>My question is related to the peculiarity of CP2K.<br>I mean if I would do this using a pure plane-wave code I wouldn't have to care about BSSE while on contrary doing on a pure GTO code either I use a fully converged basis-set or I need to add it.<br><br>My idea was that on CP2K I do not need to use BSSE but I've seen the key BSSE is present as sub-field of FORCE EVAL.<br><br>So I am confused now :-)<br><br>Do I need or do I need not to care about BSSE?<br><br>any help or give an explanation will be really welcome<span class="HOEnZb"><font color="#888888"><br><br><br></font></span></div><span class="HOEnZb"><font color="#888888">
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