On the 2175 A absorption band of hollow, onion-like carbon particles

Details On the 2175 A absorption band of hollow, onion-like carbon particles On the 2175 A absorption band of hollow, onion-like carbon particles

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406...92h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 1, p. 92-96.

Astronomy and Astrophysics

Astrophysics

26

Absorption Cross Sections, Fullerenes, Graphite, Interstellar Extinction, Particle Size Distribution, Ultraviolet Absorption, Absorption Spectra, Interstellar Matter

Scientific paper

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.

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