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Infrared light extinction by charged dielectric core-coat particles

  • Elena Thiessen
  • Rafael L. Heinisch
  • Franz X. BronoldEmail author
  • Holger Fehske
Regular Article

Abstract

We study the effect of surplus electrons on the infrared extinction of dielectric particles with a core-coat structure and propose to use it for an optical measurement of the particle charge in a dusty plasma. The particles consist of an inner core with negative and an outer coat with positive electron affinity. Both the core and the coat give rise to strong transverse optical phonon resonances, leading to anomalous light scattering in the infrared. Due to the radial profile of the electron affinity electrons accumulate in the coat region making the infrared extinction of this type of particles very charge-sensitive, in particular, the extinction due to a resonance arising solely due to the core-coat structure. The maximum of this resonance is in the far-infrared and responds to particle charges realizable in ordinary dusty laboratory plasmas.

Keywords

Plasma Physics 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Elena Thiessen
    • 1
  • Rafael L. Heinisch
    • 1
  • Franz X. Bronold
    • 1
    Email author
  • Holger Fehske
    • 1
  1. 1.Institut für PhysikErnst-Moritz-Arndt-Universität GreifswaldGreifswaldGermany

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