<div dir="ltr">Dear All,<div> I am trying to calculate atomic charges of a system whose total charge is +1. I am not able to get charges correctly as expected. </div><div><br></div><div>For the sake of better understanding, i have taken an easy system which consists of 1 water molecule and 1 H atom (Total 4 atoms). </div>
<div><br></div><div><b>First, I used Gaussian software to calculate the atomic charges on this system. </b></div><div><br></div><div><div> Mulliken atomic charges: (Method: hf 6-31g(d))</div><div> 1</div><div>
1 O -0.857873</div><div> 2 H 0.424054</div><div> 3 H 0.433819</div><div> 4 H 1.000000</div><div><br></div><div> Sum of Mulliken atomic charges = 1.00000</div></div><div><br></div><div><br>
</div><div><b>Using CP2K, i have got the following charges. </b></div><div><br></div><div><div>MULLIKEN POPULATION ANALYSIS</div><div><br></div><div> # Atom Element Kind Atomic population Net charge</div>
<div> 1 O 1 5.956324 0.043676</div><div> 2 H 2 0.814162 0.185838</div><div> 3 H 2 0.809985 0.190015</div>
<div> 4 H 2 0.419529 0.580471</div><div> # Total charge 8.000000 1.000000</div><div><br></div></div><div><br></div><div>In case of atom centered basis set, i can clearly see +1 charge is localized on 1 H atom where as it is not the case using mixed basis set. Could anybody help me in this regard? The cp2k input file is enclosed. </div>
<div><br></div><div>Thanks.</div><div><br></div><div>Regards,</div><div>Sandeep </div><div><br></div><div><br></div><div><br></div></div>