Abstract
view Abstract Citations (32) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the 2175 Angstrom Absorption Band of Hollow, Onion-like Carbon Particles Henrard, L. ; Lucas, A. A. ; Lambin, Ph. Abstract We present a theoretical result on the ultraviolet absorption of nanoscale graphite onions with a central void. The polarizability and the excitation cross section of particles in this geometry are obtained in the electrostatic (nonretarded) approximation and using a 'spherically uniaxial' dielectric tensor transported from planar graphite. We study the influence of the ratio r/R of the inner and outer radii on the extinction efficiency. It appears that the onion particles for r/R about 0.6 well reproduce the observed UV absorption bump of interstellar dust around 5.7 eV. We also investigate the effects of the hollow structure of the carbon particles on a second absorption peak around 18 eV. Publication: The Astrophysical Journal Pub Date: March 1993 DOI: 10.1086/172422 Bibcode: 1993ApJ...406...92H Keywords: Absorption Cross Sections; Fullerenes; Graphite; Interstellar Extinction; Particle Size Distribution; Ultraviolet Absorption; Absorption Spectra; Interstellar Matter; Astrophysics; ISM: DUST; EXTINCTION; ISM: MOLECULES full text sources ADS |
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