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[Silvio a Beccara <abeccara@science.unitn.it>]

Hello everybody,

I'm trying to do some simple response function phonon calculation on Ge, but 
the tutorial is not clear about some important points:

-- one (from the Tutorial, lesson 5): "One must distinguish two cases. Either 
the q wavevector connects k points that belong to the same grid, or the 
wavevector q is general." What should one do in the two different cases? 
Should I calculate the difference of all the k points I'm using, and see 
whether they correspond to a q vector? Isn't there a way to distinguish the 
cases automatically?

-- two: when is the density (command prtden) needed for a phonon calculation?

-- three: how should the dynamical matrices be read? What do the keywords 
"j1, j2, dir, pert" mean? Can the code also calculate, and give out, phonon 
eigenvectors (needed for vibrational dynamics calculation)?
--is there a way to automatically give in a list of wanted q points (needed 
for vibrational Brillouin zone integration)?

Thanks in advance, best regards

Silvio a Beccara - University of Trento, Italy