Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.astro.spbu.ru/DOP/5-OPTC/JPDOC2/node1.html
Дата изменения: Fri Nov 19 12:07:06 2010
Дата индексирования: Mon Oct 1 23:44:34 2012
Кодировка:
Поисковые слова: drad
Nanometer- and micrometer-sized solid particles are distributed
in the interstellar medium and play an important role for
astrophysical processes such as star and planet formation.
These particles show a rich chemistry and mineralogy as has been
revealed by spectroscopic astronomical observations in the last decades.
Many new observational data have been measured in the last years,
e.g. by the Infrared Space Observatory in 1995-1998, and interpretation
of these spectroscopic data is still in progress. This
requires the comparison with data of ``analog materials''
delivered by spectroscopical laboratories.
Various terrestrial analogs of cosmic solids have been studied
in chemical and physical laboratories.
However, many of these experiments neither took into account
the specifics of cosmic dust materials (composition, lattice structure,
processing, etc.), nor covered the wavelength intervals of the
current astrophysical interests. Note also that these data are
mainly in the form of graphics in papers, and
free World Wide Web (WWW) resources on the optical constants are
generally limited by several collections of refractive indices
for a few materials.
Since 1992, the Astrophysical Institute and University Observatory
(AIU) Jena operates a Chemical and Spectroscopical Laboratory with
the goal to study optical properties of analog materials of
cosmic dust in the wavelength range from the ultraviolet to
the far infrared. During this period, a compilation of optical
constants (i.e. the complex refractive index or the
complex dielectric function
) of such materials
has been created. In collaboration with the Astronomical
Institute of St.Petersburg University, this collection
was expanded into an internet database that has been
made available for the public in 1998 at
http://www.astro.uni-jena.de/Users/database/entry.html
or http://www.astro.spbu. ru/JPDOC/entry.html.
In this paper we describe the current state and future of the
database and give several examples of the data it contains
and their possible applications.
Next:Electronic database Up:A Database of Optical Previous:A Database of Optical
root
2003-03-06