Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...18712006l&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #120.06; Bulletin of the American Astronomical Society, Vol. 27, p.1452
Astronomy and Astrophysics
Astronomy
Scientific paper
Though lacking in long range order, amorphous materials possess significant short range order that is geometrically very similar to their crystalline counterparts. As a result, it is possible to estimate the dielectric function of amorphous materials from the materials' crystalline optical constants using a simple transform. The technique assumes that there is a continuous distribution of oscillators (CDO), each with its own resonant frequency. The distribution in frequencies is a result of a parallel distribution in ionic spacing. By convoluting the crystalline permittivity with a suitable function representing the distribution of resonant frequencies, we demonstrate that the dielectric functions for amorphous quartz and olivine can be computed with reasonable accuracy. The technique provides a simple means of computing the gross influence of atomic disorder on spectral characteristics of cosmic dust.
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