Abstract
A new data-treatment procedure allows for more accurate determination of electron temperatures and electron concentrations in analytical plasmas. A Thomson-scattering spectrum, useful for these determinations, is often not purely Gaussian in shape, even when the probed electrons possess a Maxwellian velocity distribution. Nonetheless, an unambiguous relationship exists between electron temperatures and concentrations that truly exist in a plasma and those calculated from a distorted Thomson-scattering spectrum. Understanding this relationship permits a look-up table to be constructed, from which observed values can be corrected. Theory concerning this procedure is described and details for using it with both a ruby laser and frequency-doubled Nd:YAG laser are discussed. Examples of electron temperature and electron concentration determined with this procedure in an ICP are given. The possibility of using the new procedure to study electron-energy distributions is also assessed.
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