<div>Hi,</div><div><br /></div><div>I have been calculating self-consistent Hirshfeld charges using my own post-processing script, but I am thinking of switching to the CP2K implementation. However, there are two questions I would need answered.</div><div><br /></div><div>One question is how it handles a well-known issue with this method, which is that it obtains the shape function from the electron densities of free ions, but sometimes these ions don't really exist. This is why my implementation is unsatisfactory: I have references for N- and N2-, but the electrons are not really attached, so the reference densities are too wide. Every self-consistent Hirshfeld implementation as to handle this somehow, I would like to know how CP2K handled it. The documentation says "This scales only the full shape function, not the added charge as in the original scheme", which is suggestive of a solution, but where can I read more about it? If the details are in one of the publications, I missed it.</div><div><br /></div><div>My second question is whether I save the reference atoms as cube files, or even better, the actual weight function used for integration (which is a(r)/(a(r)+b(r)), where a and b are the reference atom densities). It's a quirk of my application, I need precisely the weight function that was used to calculate the charges.</div><div><br /></div><div>Thanks,</div><div>Alex<br /></div>
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