Next: Amorphous magnesium silicate Up: Examples of data contained Previous: Examples of data contained . ... We have used the infrared optical constants of forsterite contained in the database for calculating the absorption cross sections of spherical and non-spherical particles in the Rayleigh limit (see Fig. The spectra are obtained by averaging the cross sections calculated for the three different crystallographic directions. ...
Next: Magnesium-aluminium oxide (spinel) Up: Examples of data contained Previous: Silicate minerals . About 85-90 % of the dust condensing in the envelopes of oxygen-rich evolved stars consist of amorphous magnesium or magnesium-iron silicates [ 6 ]. ... The calculated absorption coefficients show that MgO influences the position of the 10 and 20 m band. ... Next: Magnesium-aluminium oxide (spinel) Up: Examples of data contained Previous: Silicate minerals root 2003-03-06 ...
... Magnesium-aluminium spinel (MgAl O ) has been considered as a primary condensate in the outflows of oxygen-rich AGB stars and as a potential carrier of the 13 m emission band observed in the spectra of these stars [ 11 ]. Therefore, in the Jena laboratory, a systematic study of the infrared properties of Mg-Al oxides of both synthetic and natural origin was performed in order to derive the optical constants of these materials. ...
... This requires large volume of data on the optical constants of "analog materials". ... We have used the infrared optical constants of forsterite contained in the database for calculating the absorption cross sections of spherical and non-spherical particles in the Rayleigh limit (see Fig.1 ). ... Therefore, in the Jena laboratory, a systematic study of the infrared properties of Mg-Al oxides of both synthetic and natural origin was performed in order to derive the optical constants of these...
Our brief introductory notes on optical characterization of media define different optical parameters (including the refractive index, dielectric permittivity, absorption coefficient, reflectance, transmittance) and show their relationship. ... A Postscript version of the remarks is here . ... A brief description of the JPDOC was printed in the A Suppl (the Postscript version of the paper is here ). ...
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are: 13 (04.01.1; 02.19.2; 02.18.7) ASTRONOMY AND ASTROPHYSICS WWW database of optical constants for astronomy Th. ... The database includes references to the papers, data files and links to the Internet resources related to mea surements, calculations, compilations, or approximations of the optical constants. ... Data We have started filling the database with the data avail able for us. ...
A Database of Optical Constants of Cosmic Dust Analogs Cornelia Jager a; , Vladimir B. Il'in c , Thomas Henning b;a , Harald Mutschke a , Dirk Fabian a , Dmitry A. Semenov a ... .Petersburg State University, 198504 St.Petersburg, Russia Abstract We describe the current state and future of the WWW Jena-Petersburg Database of Optical ... The amorphous- carbon data contained in the database cover a wide range of these properties as is illustrated by Fig. ... In: Optics of Cosmic Dust. ...
The following page provides access to several SVM codes developed by us. ... Several our codes realizing some other exact and approximate methods are also available. The codes are provided by rather small (sorry) comments and test run results. ... Another page contains links to other collections of light scattering software (under construction). Our overview of the ranges of applicability of different codes is under preparation. ... Created by V.I. Last modified: 10/05/03, V.I. ...
Comments at the top of each program provide information necessary to use them. This directory contains code for infinitely long cylinders of very large sizes. If problems, contact n.voshchinnikov@spbu.ru