[Pw_forum] superposition

[Eduardo Ariel Menendez P]

Hello
I think that this combination of keywords does the job of generate the
superposition of atomic densities

               restart_mode = 'from_scratch' ,
           electron_maxstep = 1,
                   conv_thr = 1.0D+10 ,  ! Yes, it is D+10
                startingpot = 'atomic' ,
            	mixing_beta = 0.0,
                startingwfc = 'atomic'
at least it runs up to the end and writes a density file.
Regards
Eduardo
>
> On Wednesday 23 August 2006 10:33, sareh zarei wrote:
>
> > I am trying to plot difference electron density (difference between
> > electron density of crystal and superposition of atomic density) but
> > I do not know how can I calculate superposition of atomic density .
>
> the pw.x code calculates the superposition of atomic charge densities
> (from data in the pseudopotential files) in order to estimate the starting
> potential. I think you can perform a non-scf calculation starting from
> atomic charge densities. I am not sure whetrher in this case the charge
> density is saved to a file or not. If it isn't, you may need to modify the
> code
>
> Paolo
> --