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An introduction to light extinction spectrometry as a diagnostic for dust particle characterisation in dusty plasmas

Part of: Diagnostics of Dust in Plasmas

Published online by Cambridge University Press:  30 August 2016

S. Barbosa Open the ORCID record for S. Barbosa [Opens in a new window] ,
F. R. A. Onofri ,
L. Couëdel ,
M. Wozniak ,
C. Montet ,
C. Pelcé ,
C. Arnas ,
L. Boufendi ,
E. Kovacevic  and
J. Berndt
...Show all authors
S. Barbosa
Affiliation:
Université Aix-Marseille, CNRS, UMR 7343, IUSTI, 13453 Marseille CÉDEX 13, France
F. R. A. Onofri*
Affiliation:
Université Aix-Marseille, CNRS, UMR 7343, IUSTI, 13453 Marseille CÉDEX 13, France
L. Couëdel
Affiliation:
Université Aix-Marseille, CNRS, UMR 7345, PIIM, 13397 Marseille CÉDEX 20, France
M. Wozniak
Affiliation:
Université Aix-Marseille, CNRS, UMR 7343, IUSTI, 13453 Marseille CÉDEX 13, France
C. Montet
Affiliation:
Université Aix-Marseille, CNRS, UMR 7343, IUSTI, 13453 Marseille CÉDEX 13, France
C. Pelcé
Affiliation:
Université Aix-Marseille, CNRS, UMR 7343, IUSTI, 13453 Marseille CÉDEX 13, France
C. Arnas
Affiliation:
Université Aix-Marseille, CNRS, UMR 7345, PIIM, 13397 Marseille CÉDEX 20, France
L. Boufendi
Affiliation:
Université d’Orléans, CNRS, UMR 6606, GREMI, 45000 Orléans, France
E. Kovacevic
Affiliation:
Université d’Orléans, CNRS, UMR 6606, GREMI, 45000 Orléans, France
J. Berndt
Affiliation:
Université d’Orléans, CNRS, UMR 6606, GREMI, 45000 Orléans, France
C. Grisolia
Affiliation:
CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France
*
†Email address for correspondence: [email protected]
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Abstract

In this article, a detailed introduction of the light extinction spectrometry (LES) diagnostics is given. LES allows the direct in situ measurement of the particle size distribution and absolute concentration of dust clouds levitating in plasmas. Using a relatively simple and compact experimental set-up, the dust cloud parameters can be recovered with a good accuracy making minimum assumptions on their physical properties. Special emphases are given to the inversion procedure of light extinction spectra and all the required particle shape, refractive index and light extinction models. The parameter range and the limitations of LES are discussed. Two measurements in low-pressure gas discharges are presented: (i) in a direct-current (DC) glow discharge in which nanoparticles are growing from the sputtering of a tungsten cathode and (ii) in an argon–silane radio-frequency discharge. They demonstrate the capabilities of the LES technique to characterise, in situ and in real-time, the growth dynamics of nanoparticles in the size range 5–100 nm and volume concentrations in the range from a few ppb to a few ppm.

Type
Research Article
Information
Journal of Plasma Physics , Volume 82 , Issue 4 , August 2016 , 615820403
Copyright
© Cambridge University Press 2016 

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