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Spectral Absorption Characteristics of the Major Components of Dust Clouds

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Abstract

It is well known that dust clouds selectively absorb radiation in the 700–1300 cm−1 atmospheric window region. Studies have shown that dust clouds are composed of the same minerals as surface soils, although in different proportion. We have examined seventy soil samples from a number of locations around the world to determine their compositions and spectral characteristics. The results indicate that there are five major components which selectively absorb radiation in the 700–1300 cm−1 region. These are three clay minerals, silica, and calcium carbonate. Absorptivity coefficient spectra of representative soil samples are given.

© 1971 Optical Society of America

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