Line ratio diagnostics in helium and helium seeded argon plasmas

R F Boivin, S D Loch, C P Ballance, D Branscomb, M S Pindzola

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8 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)470-479
Number of pages10
JournalPlasma Sources Science and Technology
Issue number3
Publication statusPublished - 2007

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