Abstract
Extinction measurements were made for three kinds of amorphous carbon grains in the range 2100 A-340 μm. Absolute values of extinction coefficients from different sources vary by almost constant factors. Wavelength dependences of extinction curves show a λ−1 or less steep fall off, against a λ−2 or steeper fall off of graphite grains. Small humps are found around 6.3, 8, 13.3 and 90 μm, although their origins are not yet clear. The infrared properties of amorphous carbon grains suggest that they could supply a significant amount of far-infrared emission noted in recent astronomical observations.
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