Abstract
The continuous atomic absorption cross section of sodium vapor has been measured using photoelectric techniques from the $3s^{2}S\ensuremath{\rightarrow}\mathrm{np}^{2}P^{0}$ series limit at 2412.6 \AA{}, down to 1000 \AA{}. The bandwidth of the monochromator was 1 \AA{}, and values of the cross section were obtained at about 2-\AA{} intervals. The best value for the atomic absorption cross section at the series limit was 0.130\ifmmode\pm\else\textpm\fi{}0.018 Mb. A zero minimum was observed at 1950 \AA{}, in agreement with theoretical predictions but conflicting with previous experimental results. The reasons for this conflict are discussed, and a description is given of the experimental procedures adopted.
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