Extinction coefficients of carbon grains in far-infrared

Details Extinction coefficients of carbon grains in far-infrared Extinction coefficients of carbon grains in far-infrared

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987infph..27..399w&link_type=abstract

Infrared Physics (ISSN 0020-0891), vol. 27, Nov. 1987, p. 399-405.

Physics

3

Carbon, Far Infrared Radiation, Infrared Absorption, Interstellar Extinction, Stellar Envelopes, Crystallinity, Interstellar Matter, Vibrational Spectra

Scientific paper

With a simple model it is shown that the wavelength-dependence of the extinction of crystalline and amorphous carbon grains in the FIR region is caused by the vibrational density of states gc(omega) and gd(omega), respectively. Both are approximated by the well known expressions of the model of the linear chain, and the susceptibilities in the FIR are calculated by the equation of Kubo (1957). The result is that the extinction in FIR of the crystalline carbon grains has a 1/lambda-squared dependence and the amorphous modification has a 1/lambda dependence. The results are compared with laboratory measurements, astrophysical observations and other theoretical models.

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