Line ratio diagnostics in helium and helium seeded argon plasmas

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Abstract

We investigate the potential use of line ratio diagnostics to evaluate electron temperature in either helium or helium seeded argon plasmas. Plasmas are produced in a helicon plasma source. A rf compensated Langmuir probe is used to measure both the electron temperature and plasma density while a spectrometer is used to measure He I line intensities from the plasma. For all plasma densities where the electron temperature remains at 5 1 eV, three He line ratios are measured. Each experimental ratio is compared with the prediction of three different collisional radiative models. One of these models makes uses of recent R-matrix with pseudo-states calculations for collisional rate coefficients. A discussion related to the different observations and model predictions is presented. © 2007 IOP Publishing Ltd.

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Boivin, R. F., Loch, S. D., Ballance, C. P., Branscomb, D., & Pindzola, M. S. (2007). Line ratio diagnostics in helium and helium seeded argon plasmas. Plasma Sources Science and Technology, 16(3), 470–479. https://doi.org/10.1088/0963-0252/16/3/006

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