In-situ diagnostics of hydrocarbon dusty plasmas using quantum cascade laser absorption spectroscopy and mass spectrometry. (14th July 2014)

• Record Type: Journal Article
• Authors: Ouaras, K.; Delacqua, L. Colina; Lombardi, G.; Röpcke, J.; Wartel, M.; Bonnin, X.; Redolfi, M.; Hassouni, K.
• Is Part Of: Journal of plasma physics. Volume 80:Number 6(2015:Dec.)
• Page Start: 833
• Page End: 841
• Publication Date: 2014-07-14
• Subjects: Plasma (Ionized gases) -- Periodicals; 530.4405
• DOI: 10.1017/S0022377814000361
• Languages: English
• ISSNs: 0022-3778

Abstract

Abstract : The formation of carbon nanoparticles in low pressure magnetized H2 /CH4 and H2 /C2 H2 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.