<div dir="ltr">Thank you so much<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Aug 19, 2014 at 1:29 AM, Paolo Giannozzi <span dir="ltr"><<a href="mailto:paolo.giannozzi@uniud.it" target="_blank">paolo.giannozzi@uniud.it</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="">On Sun, 2014-08-17 at 23:27 +0430, Mohamad Moadeli wrote:<br>
><br>
> I am doing calculations with QE and I am trying to use DFT-D for a<br>
> combined system, but I do not know what the unit of C6 coefficient is?<br>
> (as implemented)<br>
<br>
</div>from the Modules/mm_dispersion.f90 file:<br>
<br>
! vdw C6 and radii for the first 86 atoms for the DFTD2 method<br>
! Data from the DFT-D2 section of the dftd3.f file found on<br>
S.Grimme's home page:<br>
!<br>
<a href="http://www.thch.uni-bonn.de/tc/index.php?section=downloads&subsection=DFT-D3" target="_blank">http://www.thch.uni-bonn.de/tc/index.php?section=downloads&subsection=DFT-D3</a><br>
! See also S. Grimme, J. Comp. Chem., 27, 1787 (2006)<br>
! First column: C6, converted to Ry*Bohr^6 units<br>
! (in the paper: J*nm^6/mol, conversion factor: 1 J*nm^6/mol =<br>
34.69 Ry*Bohr^6)<br>
! Second column: radii, in Bohr (in the paper they are in A)<br>
!<br>
DATA vdw_coeffs / &<br>
4.857, 1.892,&<br>
...<br>
<span class="HOEnZb"><font color="#888888"><br>
P.<br>
<br>
--<br>
Paolo Giannozzi, Dept. Chemistry&Physics&Environment,<br>
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>
Phone +39-0432-558216, fax +39-0432-558222<br>
<br>
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</font></span></blockquote></div><br></div>