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Database of Optical Properties

In astrophysics, the optical constants mainly are used to calculate the optical properties of scatterers, i.e. cross-sections, scattering matrix, etc. For many applications, it is necessary to understand general trends in the data. This understanding often can be gained from consideration of results obtained by simplified scattering models. Optical properties derived from such models have been discussed in some books (see, e.g., [2,3]) and in principle can be calculated by using various light-scattering tools which are freely available via the internet [4]. Nevertheless, there is a definite necessity of a WWW database devoted to systematic consideration of the optical properties of various model scatterers and related topics. As of this writing, our database will include:

• original codes realizing different methods to calculate the optical properties of nonspherical (inhomogeneous) particles;
• review(s) of exact and approximate methods of light scattering theory (incl. discussion of their applicability ranges);
• a database of several thousands references to papers on various aspects of light scattering theory and its applications;
• a graphics library illustrating light scattering by particles of different size/shape/ structure (a part of the data will be in tabular form to serve as benchmarks);
• a special tool to calculate on-line selected optical characteristics of different scatterers (homogeneous and core-mantle spheres, infinite cylinders, spheroids, etc.);
• a self-training algorithm of determination of the optical properties of fractal-like clusters;
• a collection of links to related internet resources.

The work on all the parts of the DOP is either in progress or has been finished. It is undertaken by several persons from different institutes of former Soviet Union countries under support of an INTAS grant. The DOP will be (partly) available via the Internet [5] upon its completion scheduled at the end of 2002. Because of the large volume due to the graphics library, the whole database may be available only on CDs.