Determination of the Gas Temperature of an Argon Microwave Plasma at Atmospheric Pressure Using van der Waals Broadening

Details Determination of the Gas Temperature of an Argon Microwave Plasma at Atmospheric Pressure Using van der Waals Broadening Determination of the Gas Temperature of an Argon Microwave Plasma at Atmospheric Pressure Using van der Waals Broadening

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..938..287y&link_type=abstract

SPECTRAL LINE SHAPES IN ASTROPHYSICS: VI Serbian Conference on Spectral Line Shapes in Astrophysics (VI SCSLSA). AIP Conference

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Pressure, Density, And Temperature, Line Shapes, Widths, And Shifts, Other Gas Discharges

Scientific paper

For the gas temperature determination for a discharge at atmospheric pressure, the ro-vibrational emission spectra of the molecular species are usually used, but exist cases when it is difficult to detect them. In order to analyze the possibility to use the van der Waals broadening of the neutral-argon lines to determine the gas temperature in an argon surface-wave sustained discharge (SWD) at atmospheric pressure, the values of the gas temperature inferred from the atomic lines with that ones obtained from the analysis of the OH molecular specie spectrum, were compared. If the Lorentzian broadening of a spectral line depends on axial position, this line is sensitive to the electron density variation. This is in particular the case for the 522.1, 549.6 and 603.2 nm lines. For this reason, these lines could be used to measure the electron density in discharges at atmospheric pressure. For these spectral lines a linear fit is obtained, which intersects the ordinate at a point corresponding to the Lorentzian width for zero electron density. This value can be considered approximately equal to the van der Waals width and is used here to calculate the plasma gas temperature. From our results and the comparison with other authors we can conclude that the method, proposed in this work, gives a possibility to estimate the gas temperature from the van der Waals broadening of atomic lines.

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