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In-situ diagnostics of hydrocarbon dusty plasmas using quantum cascade laser absorption spectroscopy and mass spectrometry

Part of: Physics of Dusty Plasmas

Published online by Cambridge University Press:  14 July 2014

K. Ouaras ,
L. Colina Delacqua ,
G. Lombardi ,
J. Röpcke ,
M. Wartel ,
X. Bonnin ,
M. Redolfi  and
K. Hassouni
K. Ouaras
Affiliation:
LSPM-CNRS, Université Paris 13, Sorbonne Paris Cité, 99 av. Jean-Baptiste Clément, 93430 Villetaneuse, France
L. Colina Delacqua
Affiliation:
LSPM-CNRS, Université Paris 13, Sorbonne Paris Cité, 99 av. Jean-Baptiste Clément, 93430 Villetaneuse, France
G. Lombardi*
Affiliation:
LSPM-CNRS, Université Paris 13, Sorbonne Paris Cité, 99 av. Jean-Baptiste Clément, 93430 Villetaneuse, France
J. Röpcke
Affiliation:
INP Greifswald, Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany
M. Wartel
Affiliation:
LSPM-CNRS, Université Paris 13, Sorbonne Paris Cité, 99 av. Jean-Baptiste Clément, 93430 Villetaneuse, France GREMI, UMR7344, CNRS/Université d'Orléans, site de Bourges, Rue G. Berger, 18028 Bourges, France
X. Bonnin
Affiliation:
LSPM-CNRS, Université Paris 13, Sorbonne Paris Cité, 99 av. Jean-Baptiste Clément, 93430 Villetaneuse, France
M. Redolfi
Affiliation:
LSPM-CNRS, Université Paris 13, Sorbonne Paris Cité, 99 av. Jean-Baptiste Clément, 93430 Villetaneuse, France
K. Hassouni
Affiliation:
LSPM-CNRS, Université Paris 13, Sorbonne Paris Cité, 99 av. Jean-Baptiste Clément, 93430 Villetaneuse, France
*
†Email address for correspondence: lombardi@lspm.cnrs.fr
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Abstract

The formation of carbon nanoparticles in low pressure magnetized H2/CH4 and H2/C2H2 plasmas is investigated using infrared quantum cascade laser absorption, mass spectrometry, and electrostatic probe measurements. Results showed that dust formation is correlated to the presence of a significant amount of large positively charged hydrocarbon ions. Large negative ions or neutral hydrocarbon were not observed. These results, along with a qualitative comparison of diffusion and reaction characteristic, suggest that a positive ion may contribute to the growth of nanoparticles in hydrocarbon magnetized plasmas.

Type
Research Article
Information
Journal of Plasma Physics , Volume 80 , Issue 6 , December 2014 , pp. 833 - 841
Copyright
Copyright © Cambridge University Press 2014 

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References

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