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Absorption of CO2 laser radiation is experimentally shown to be a useful plasma-diagnostic technique, spatially, temporally, and quantitatively. Electron densities determined from absorption agree well with shock-produced plasma values. Comparison of densities obtained via absorption, interferometry, and Langmuir probes in a plasma jet also show good agreement in magnitude and spatial dependence.
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Offenberger et al. (1972) studied this question.
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