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Gas temperature and electron temperature measurements by emission spectroscopy for an atmospheric microplasma

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Mariotti, D, Shimizu, Y, Sasaki, T and Koshizaki, N (2007) Gas temperature and electron temperature measurements by emission spectroscopy for an atmospheric microplasma. JOURNAL OF APPLIED PHYSICS, 101 (1). 013307-1. [Journal article]

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DOI: 10.1063/1.2409318

Abstract

A microplasma suitable for material processing at atmospheric pressure in argon and argon-oxygen mixtures is being studied here. The microplasma is ignited by a high voltage dc pulse and sustained by low power (1-5 W) at 450 MHz. the mechanisms responsible for sustaining the microplasma require a more detailed analysis, which will be the subject of further study. Here it is shown that the microplasma is in nonequilibrium and appears to be in glow mode. The effect of power and oxygen content is also analyzed in terms of gas temperature and electron temperature. Both the gas temperature and the electron temperature have been determined by spectral emission and for the latter a very simple method has been used based on a collisional-radiative model. It is observed that power coupling is affected by a combination of factors and that prediction and control of the energy flow are not always straightforward even for simple argon plasmas. Varying gas content concentration has shown that oxygen creates a preferential energy channel towards increasing the gas temperature. Overall the results have shown that combined multiple diagnostics are necessary to understand plasma characteristics and that spectral emission can represent a valuable tool for tailoring microplasma to specific processing requirements. (c) 2007 American Institute of Physics.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:261
Deposited By:Dr Davide Mariotti
Deposited On:17 Sep 2009 15:17
Last Modified:19 Mar 2012 11:56

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