Storage and light scattering of microparticles in a ring-type electrodynamic trap
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We employ a Paul-Straubel ring-type electrodynamic trap for studies of single microparticles. Such a trap provides ready access for laser beams to a stored species and is especially suited for scattering and spectroscopic studies of fine particles. We derive the pseudopotential for such a trap and determine the stability regions for confinement of charged particles considering also the viscous force of a buffer medium and the force of gravity. The dynamics of microparticles in such a trap is numerically simulated. The diffraction pattern of light scattered on a polystyrene particle of about 10 μm diameter was registered. For measuring Raman spectra from a single dipicolinic acid microparticle, we used excitation at 488 nm and detection with a fiber optics spectrometer. To improve the collection of light, the trap with the stored particle was placed inside an elliptical mirror. © 2007 American Institute of Physics.
author list (cited authors)
Kolomenskii, A. A., Jerebtsov, S. N., Stoker, J. A., Scully, M. O., & Schuessler, H. A.