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Please use this identifier to cite or link to this item: http://arks.princeton.edu/ark:/88435/dsp01qb98mj541
Title: The Dielectric Function of "Astrodust", and Absorption and Scattering Cross Sections for Spheroids
Contributors: Draine, Bruce T.
National Science Foundation
Keywords: interstellar dust
dielectric function
optics of small particles
infrared
Issue Date: 2021
Publisher: Princeton University
Abstract: The dielectric function for "Astrodust" grain material is provided for different assumed values of the dust grain shape (spheroid axis ratio) and porosity (vacuum fraction), and fraction of the interstellar iron present as metallic inclusions. For each case, the dielectric function is obtained by requiring that the grains reproduce the observed infrared opacity, and match to a physically reasonable dielectric function at 1 micron, and extending to X-ray energies. The derived dielectric functions satisfy the Kramers-Kronig relations. Dielectric functions are provided from 1 Angstrom to 5 cm (12.4 keV to 2.59e-5 eV). For each dielectric function, we also calculate absorption and scattering corss sections for spheroidal grains, for three orientations of the grain relative to incident linearly-polarized light, for wavelengths from the Lyman limit (0.0912 micron) to the microwave (4 cm), and grain "effective radii" a_eff from 3.162A to 5.012 micron.
URI: http://arks.princeton.edu/ark:/88435/dsp01qb98mj541
https://doi.org/10.34770/9ypp-dv78
Referenced By: Astrophysical Journal, doi not yet available
Appears in Collections:Research Data Sets

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