On Aug 1, 2009, at 3:25 , xirainbow wrote: > And at the up email, you said it shoud be "C_{na \alpha, nb \beta} > (R)", > instead of "F_{\alpha,\beta}^{i,j}(R),". I am a little confused.
and I am fed up with people who can't sort out even the tiniest and most trivial detialsdetails. Force constants have two atom indices, two polarization indices, depend upon lattice vectors. --- Paolo Giannozzi, Dept of Physics, University of Udine via delle Scienze 208, 33100 Udine, Italy Phone +39-0432-558216, fax +39-0432-558222