Infrared optical constants of ammonium sulfate, sahara dust, volcanic pumice, and flyash

Applied Optics
F E Volz

Abstract

Spectra of the real and imaginary parts of the refractive index m = n ' - in from 2.5 microm to 40 microm of ammonium sulfate, Sahara dust (as collected at Barbados), volcanic dust (pumice), and dust from a coalfired power plant are presented. With a peak absorption index n = 1.0 at 10 microm Sahara dust turns out to be the strongest absorber in the atmospheric window. The dispersion of n' is also very pronounced near 9 microm and 20 microm. 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.

References

Jan 8, 1971·Nature·R Chester, L R Johnson

Citations

Apr 7, 2015·Journal of Geophysical Research. Atmospheres : JGR·Shona Mackie, Matthew Watson
Jun 25, 2002·Applied Optics·Stephen M Doss-HammelKenneth L Davidson
Mar 6, 2003·Applied Optics·Maurice A JarzembskiDean R Cutten
Jun 15, 1983·Applied Optics·L P Stearns, R F Pueschel
Jul 1, 1973·Applied Optics·E E Remsberg
May 15, 2019·Sensors·Jie ChengGuanhua Zhou
Apr 15, 2020·Science Advances·Adeyemi A Adebiyi, Jasper F Kok

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