Microscopic description of glass-light interaction

[random3f]

Hi all,
could you suggest me references that can help me in the following calculation?
I would like to see how to describe microscopically the interaction of light (or in general of an external field) with a disordered system such as glass ( I can find literature only for materials modeled with regular lattices). Could you suggest which model has to be considered for a disordered system?
To be concrete: how can microscopically 'explain' the curve permittivity or permeability vs frequancy of the external field (light) for a glass?

Thanks in advance!

 

[DrDu]

I think this article is a good starting point:

@article{RevModPhys.46.465,
title = {The theory and properties of randomly disordered crystals and related physical systems},
author = {Elliott, R. J. and Krumhansl, J. A. and Leath, P. L.},
journal = {Rev. Mod. Phys.},
volume = {46},
issue = {3},
pages = {465--543},
numpages = {0},
year = {1974},
month = {Jul},
publisher = {American Physical Society},
doi = {10.1103/RevModPhys.46.465},
url = {http://link.aps.org/doi/10.1103/RevModPhys.46.465}
}

Also the book by Economou treats disordered systems:
http://books.google.de/books?hl=de&...bWIxsDd3LmXfO81W2ihbNXNPg#v=onepage&q&f=false