<div dir="ltr"><div>Hi!</div><div>I have never done that tutorial, <span id="gmail-result_box" class="gmail-short_text" lang="en"><span class="gmail-">and maybe what I said a priori does not make sense</span></span>, if this is the case I apologize.</div><div><br></div><div>A water molecule have -76 Ha of energy in an all electron calculation, like as a tipical Gaussian09 calculation (with a numeric discrepancies), or this paper (complex all electron calculations):<br></div><div><br></div><div><a href="https://aip.scitation.org/doi/abs/10.1063/1.3665391?journalCode=jcp">https://aip.scitation.org/doi/abs/10.1063/1.3665391?journalCode=jcp</a></div><div><br></div><div>But, <span id="gmail-result_box" class="gmail-short_text" lang="en"><span>as far as I know, and i think in your case it is like that, CP2K use a pseudopotential (PP) aproximation, and is not an all electron calculation, therefore the energy of water molecules will be great refered to the all electron calculation, because PP remove the core electrons from the energy calculation (but there are presents in the hamiltotian potentials somehow). For that the energy of a PP calculation does not have a physical interpretation unlike all electron calculation.</span></span></div><div><span id="gmail-result_box" class="gmail-short_text" lang="en"><span><br></span></span></div><div><span id="gmail-result_box" class="gmail-short_text" lang="en"><span>Regards</span></span><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">2018-08-06 11:11 GMT-04:00 charitha perera <span dir="ltr"><<a href="mailto:perer...@gmail.com" target="_blank">perer...@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hello,<br>I'm a beginner in cp2k and when I follow tutorial, I could successfully optimized a water molecule with -17 a.u. total energy. But in the literature it is -76 a.u. I'm wondering what kind of total energy is given by cp2k program?<br><br>Thank you<span class="HOEnZb"><font color="#888888"><br></font></span></div><span class="HOEnZb"><font color="#888888">
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