Computer Science
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.336..227w&link_type=abstract
Nature (ISSN 0028-0836), vol. 336, Nov. 17, 1988, p. 227, 228.
Computer Science
25
Graphite, Interstellar Extinction, Interstellar Matter, Anisotropy, Crystal Structure, Dielectrics, Electric Dipoles
Scientific paper
Kroto and McKay (1988) have suggested that carbon particles in interstellar dust have the form of quasi-icosahedral spiral shells, with the hexagonal graphitic planes perpendicular to the radius, like the layers of an onion. The discrete dipole approximation has been used to calculate the UV extinction curves of small spherical particles with the tensor dielectric constant of graphite but with the c-axis always running parallel to the radius vector. The feature at a wavelength of 2200 A is doubled in width and moved to a wavelength about 80 A shorter in comparison to the parameters derived form the usual Mie theory approximation for a mixture of particles with scalar dielectric constants. For larger particles, the peak shifts to longer wavelengths, but for a radius of about 300 A which puts the peak at 2200 A, the width of absorption by quasi-icosahedral particles is too large to fit the data.
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