Hello valued developers and users,<div><br /></div><div>I am trying to setup DFTB3 with D3 correction and GAMMA damping and I can't find the answers to all of my questions in the forum threads. Also some answers are not completely clear to me.</div><div><br /></div><div>1) If I am to use the D3 correction - is it enough to include </div> DISPERSION_TYPE D3(BJ)<br /> DISPERSION_PARAMETER_FILE ${LIBPATH}/dftd3.dat<div><br /></div><div>or should I also include the &VDW_POTENTIAL section and where if I am not using DFT (&XC section)</div><div><br /></div><div>2) does D3(BJ) work with DFTB3 or does only D3 work</div><div><br /></div><div>3) are both the D3 and the D3(BJ) parameters in the dft3d.dat file. If not - for D3(BJ) I can find only a1, a2 and s8, but I can't find anywhere the fourth one. Why are the default values set to 0</div><div><br /></div><div>4) is the keyword DFTB3_PARAM in KIND the Hubbard parameter and is it necessary. The 3ob .skf files technically include it, basically does CP2K read it from the .skfs.</div><div><br /></div><div>5) is using 3ob enough for DFTB3 or do I have to include the keyword DIAGONAL_DFTB3 in &DFTB</div><div><br /></div><div>6) if HB_SR_GAMMA is the GAMMA damping for hydrogen bonds, is its use recommended for general organics at the moment or it would rather worsen the results, as before</div><div><br /></div><div>I am attaching an example input file for QM/MM Metadynamics.</div><div><br /></div><div>Best Regards,</div><div>Dobromir</div><div><br /></div><div> </div>
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