Physics – Optics
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apopt..17.3521r&link_type=abstract
Applied Optics, vol. 17, Nov. 15, 1978, p. 3521, 3522.
Physics
Optics
Cosmic Dust, Interstellar Extinction, Interstellar Matter, Iron, Photoabsorption, Plasma Resonance, Astronomical Photometry, Conduction Electrons, Metal Particles, Refractivity
Scientific paper
The absorption of granular deposits of iron is evaluated to see if iron may be considered as interstellar dust in order to explain certain characteristics of the interstellar extinction curve. Iron deposits were prepared at room temperature at a pressure of 10 to -9th power torr in sealed ampoules. Photometric measurements were made of changes in the normal incidence transmittance and reflectance as a function of incident energy. It was found that granular deposits of iron have a broad peak in the spectra near 4 eV. This behavior is quite different from the bulk metal which exhibits a maximum near 2.5 eV. The 4-eV peak results from collective oscillations of electrons in metallic grains. This may be explained by Mie and Maxwell-Garnett theories when generalized to non-spherical particles. It is concluded that iron grains may be significant in explaining characteristics of the interstellar extinction curve, especially in the ultraviolet.
Palmari J. P.
Rasigni Georges
Rasigni M.
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