A system to determine the density and temperature of ground-state hydrogen atoms in a hydrogen plasma by measurement of the absorption of Lyman-beta or Lyman-gamma radiation is described. The Lyman-series radiation is generated by resonant four-wave sum-frequency mixing in mercury vapor. A wide range of hydrogen atom densities can be measured by employing these two transitions. A sample measurement on a H− ion-source discharge is presented. Extensions to Lyman-alpha and other vacuum-ultraviolet wavelengths are discussed.
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Stutzin et al. (1988) studied this question.
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