S. G. Jennings, "Attenuated total reflectance measurements of the complex refractive index of polystyrene latex at CO2 laser wavelengths," J. Opt. Soc. Am. 71, 923-927 (1981)
Attenuated total reflectance (ATR) measurements of the complex refractive index m of 5, 10, 15, 20, and 30% water suspensions of polystyrene latex are presented for CO2 laser wavelengths (measurements for the 30% suspension are for λ = 10.591 μm only). The use of the Maxwell Garnet mixture rule for the real index and the imaginary index (at λ = 9.305 μm) and an extrapolation scheme for the remaining values of imaginary index yield the values m = 1.709 − 0.07i (λ = 9.305 μm); m = 1.887 − 0.06i (λ = 9.504 μm); m = 1.705 − 0.04i (λ = 9.694 μm); m = 1.764 − 0.045i (λ = 10.591 μm). ATR measurements of the complex index of water and water–ammonium sulfate solutions are in reasonably good agreement with those previously published.
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The inferred values of polystyrene latex assume a density of 1.05 g cm−3 for polystyrene latex and neglect the small fraction (0.7%) of emulsifier and surfactant impurities in the latex suspensions.
An extrapolation procedure using a least-squares one-degree polynomial fit was used.
The inferred values of polystyrene latex assume a density of 1.05 g cm−3 for polystyrene latex and neglect the small fraction (0.7%) of emulsifier and surfactant impurities in the latex suspensions.
An extrapolation procedure using a least-squares one-degree polynomial fit was used.