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Absorption coefficient (a) and refractive index (b) of DL-phenyllactic acid at . The curves correspond to measurements of a pure pellet (solid circles) and diluted samples of the ground and unground substances (estimated grain size ) mixed with PE.
Absorption coefficient and refractive index of DL-phenyllactic acid and PE. The inset illustrates light scattering by the Christiansen effect. At an absorption peak, stronger scattering occurs on the low-frequency wing due to the larger refractive index contrast.
Absorption coefficient of the finely ground phenyllactic acid (PA) sample (lower solid line) and calculated scattering loss (dashed line). Their sum (upper solid line) is plotted with the spectrum of the unground sample (open circles), both vertically offset for better clarity.
Accumulated scattering phase per path length of the unground sample (solid circles). The solid curves are calculated Mie-scattering efficiencies for spherical particles of DL-phenyllactic acid with diameters .
Absorption coefficient (a) and refractive index (b) of fructose measured for a diluted sample at (dashed lines). Using the indices of fructose and PE, the scattering contribution to the absorption coefficient is calculated and removed from the spectrum.
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