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Analysis of excitation processes and electron temperature changes from spectral data in a dc micro plasma discharge

Davide Mariotti, Paul Maguire, Charles M O Mahony and James McLaughlin

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A micro scale dc plasma discharge was studied to determine the potentialities for lab-on-the-chip applications. Different working conditions for the micro plasma discharge were considered: the pressure was varied between 2.7 and 5.3 kPa and the applied dc voltage was between 400 and 540 V, generating a discharge current in the range of 0.02–0.09 mA. The electrode distance was maintained at 0.025 cm and argon was used as the gas for the formation of plasma discharges. The number densities of excited states were determined by spectral emission data (400–1000 nm) and then were calculated by introducing a few assumptions: comparison of experimental and calculated number densities allowed an analysis of a volume averaged electron energy distribution function. Also, it was possible to estimate an effective electron temperature for different conditions of pressure and applied voltage.


PACS

52.80.-s Electric discharges

52.25.Fi Transport properties

52.20.Fs Electron collisions

52.25.Os Emission, absorption, and scattering of electromagnetic radiation

52.75.-d Plasma devices

52.25.Kn Thermodynamics of plasmas

Subjects

Plasma physics

Dates

Issue 4 (November 2004)

Received 12 May 2004

Published 9 September 2004



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