Simple constrained DFT question


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Here I have a very simple question about CDFT in NWChem. I used the following input line for CDFT

CDFT ifatom1 latom1 ifatom2 latom2 charge constaint_value

where ifatom1,2 and latom1,2 are the indices to define the donor and acceptor group, respectively. Well, the meaning of constaint_value is not clear for me. Is it the net charge difference of the donor and acceptor (donor - acceptor), or charge(donor-acceptor)/2, as mentioned in the paper J. Phys. Chem. A 110, 9212 (2006)?

Thank you very much for any help!


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