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Schematic diagram of the REM reflectometer.
(a) The case where the refractive index of immersion liquid and particles is nearly equal. The solid line represents reference reflectance curve, i.e., ideal matching and dotted line the experimental data and (b) the case where notable refractive index difference exists.
Fitting error as a function of refractive index of immersion liquid. Minimum point on “curve” represents the refractive index of particles at the wavelength of 590 nm. White and black spheres indicate measurements of different but identically prepared samples.
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