My overall interest was looking at response of molecules maybe with
50 atoms including a few metals like Ag, Sn, or Pb. A fully relativistic
approach is probably needed. I don't care about a dielectric constant
vs frequency plot and just need some indication of the nature of
electronic response to EUV radiation in the 10-20 nm range.
Details of excitons may end up being important but its mostly exploratory
interest now.
Is there some other implementation of the stochastic thing in c or c++
that may be a useful starting point?
Thanks.