Abstract

Optical extinction measurements of acetylene smoke in a 1.8-m tube at wavelengths of 0.5145 and 10.6 μm give specific extinction coefficients AE of 9.8 ± 0.8 and 0.94 ± 0.1 m2 g−1 respectively. The Mie theory applied to unagglomerated small carbon spheres can simulate the optical properties of acetylene smoke in the visible region but underestimates the specific extinction at 10.6 μm by at least a factor of 2. Both the visible and infrared experimental data are consistent with a model in which agglomeration of the smoke particles enhances the infrared extinction over that from small individual spheres.

© 1980 Optical Society of America

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