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Electron Number Densities in Analytical Inductively Coupled Plasmas as Determined via Series Limit Line Merging

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Abstract:

A convenient and a rapid technique is introduced to estimate the electron number densities, n e , in inductively coupled plasmas. The method is based on previously reported observations that the principal quantum number of the last discernible line in a series limit depends on n e . The spatially integrated n e values, as determined from the spectra of H, Li, Mg, Al, Ca, and K emitted in a pure Ar plasma ranged between ∼4 × 1014 and ∼3 × 1015 cm−3 for various forward powers and observation heights. These results agreed with n e values derived from other methodologies such as the Stark broadening and absolute continuum intensity.

Keywords: Electron number density; Inductively coupled plasma; Inglis-Teller equation; Spectral line merging

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702814732490

Affiliations: 1: Ames Laboratory and Department of Chemistry, Iowa State University, Ames, Iowa 50011 2: Ames Laboratory and Department of Chemistry, Iowa State University, Ames, Iowa 50011; present address: Union Carbide Corporation-Nuclear Division, Oak Ridge Y-12 Plant, P.O. Box Y, Building 9995, Oak Ridge, TN 37830

Publication date: July 1, 1981

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