[Wien] a question about OPTIC

[mehrdad dadsetani]

Hi Ruijan and Igor
please see this paper
R.Ahuja O.ericsson,PRB.%4 (1996) 10419.
M.dadsetani
 


--- Igor Mazin <wienuser at yahoo.com> wrote:

> No, you cannot.
> 
> The answer depends on what is the size (and
> sometimes
> the shape) of the individual grains in the smaple
> that
> is being measured. In some cases one should average
> epsilon, as suggested below (and derive the
> measurables from the average epsilon), in the other
> the measured quanity (reflectivity or EELS function,
> -Im[1/eps]), and, if needed, reconstruct the
> effective
> epsilon from the averaged measurable. The point is
> that the "average" epsilon for a polycrystalline
> sample depends on what experiment is being
> discussed.
> These issues are subject of the effective media
> theory
> in optics.
> 
> --- mehrdad dadsetani <dadsetani_m at yahoo.com> wrote:
> 
> > Hi Ruijan,
> > you can obtain the total imaginary part of
> > dielectric
> > function
> > with (2*Exx+Ezz)/3 and for the other parameter as
> > same.
> > Regads
> > M.dadsetani
> > isfahan university, Iran
> > 
> > 
> > --- Ruijuan Xiao <rjxiao at blem.ac.cn> wrote:
> > 
> > > Dear users,
> > >   When I use the OPTIC program in WIEN2k to
> > > calculate the dielectric functions and loss
> > > functions, I found that there are two or three
> > > components to epsilon for the non-cubic
> > systems(e.g.
> > > for hexagonal,they are epsilon(xx) and
> > > epsilon(zz)).I wonder can the final epsilon and
> > loss
> > > function be obtained by simply averaged over
> these
> > > different components?
> > >   
> > >   I am looking forward to your reply. Thank you
> > very
> > > much.
> > > 
> > > Best regards,
> > > 
> > > Sincerely,
> > > Ruijuan Xiao
> > > 
> > > 
> > > 
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