A review on Light Extinction Spectrometry as a diagnostic for dust particle characterization in dusty plasmas
Résumé
In this article, a detailed description of the light extinction spectrometry diagnostics is given. It allows the direct in-situ measurement of the particle size distribution and absolute concentration of a dust cloud levitating in plasmas. Using a relatively simple and compact experimental setup , the dust cloud parameters can be recovered with a good accuracy making minimum assumptions on their physical properties. Special emphasises are given to the inversion of light extinction spectra and all the required particle shape, refractive index and the light extinction models. The parameter range and the limitations of the diagnostic are discussed. In addition, two examples of measurements in low-pressure gas discharges are presented: in a DC glow discharge in which nanopar-ticles are growing from the sputtering of a tungsten cathode, and in an Argon-Silane radio-frequency discharge.
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