Abstract
Single and small numbers of sodium nanoparticles were studiedin a cold plasma environment of a modified quadrupole trap(optical + low-frequency electrical field). The singlenanoparticle radius (mass) was first determined by observing itsBrownian motion. Particle size evolution (~90-510 nm)was then determined by applying Mie theorycalculations to the intensity of light scattered by a smallnumber of nanoparticles.The trapping potential was determined using a two-nanoparticlesystem as a probe. As a result, the electrical charge of thenanoparticles and its evolution (~200-1000 elementarycharge units) was also found.Strong depolarization of one-nanoparticle scattered light wasobserved.
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