Abstract
Spectra of the real and imaginary parts of the refractive index m = n′ − in″ from 2.5 μm to 40 μm of ammonium sulfate, Sahara dust (as collected at Barbados), volcanic dust (pumice), and dust from a coal-fired power plant are presented. With a peak absorption index n″ = 1.0 at 10 μm Sahara dust turns out to be the strongest absorber in the atmospheric window. The dispersion of n′ is also very pronounced near 9 μm and 20 μm. Volcanic and coal-fire dust also absorb in the window region stronger than most of our earlier-investigated more normal aerosol fractions. The data for ammonium sulfate are compared with Remsberg’s measurements on an aqueous solution.
© 1973 Optical Society of America
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Frederic E. Volz
Appl. Opt. 11(4) 755-759 (1972)
Harry D. Downing, Lary W. Pinkley, P. P. Sethna, and Dudley Williams
J. Opt. Soc. Am. 67(2) 186-190 (1977)
Ellis E. Remsberg
Appl. Opt. 12(7) 1389-1390 (1973)