Hi all, In SCC-DFTB,when calculate the foce in MD, why there is no need of gradient of the charge fluctuation to the nuclear displacement? gxaaas -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.zfn.uni-bremen.de/pipermail/dftb-plus-user/attachments/20120329/8c88c104/attachment.htm>