Abstract
An enhanced, high-precision, in situ method to determine the radii and refractive indices of single microparticles embedded in a plasma is presented. The particles are confined in the plasma sheath and illuminated with laser light that has a well-defined and adjustable state of polarization. Using an out-of-focus imaging setup, the angle- and polarization-resolved scattering intensities are measured and compared to Lorentz–Mie theory. A two-stage data evaluation process is used to obtain the particle size and the complex refractive index of different particle materials as a function of interaction time with the plasma.
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