## Abstract

The atomic absorption cross section of potassium has been measured between 580 and 1000 Å. The region between 685 and 1000 Å showed continuous absorption and the values around 1000 Å were consistent with those obtained previously. In the region between 580 and 685 Å several autoionization lines were observed, in particular two strong lines corresponding to the ${\left(3\mathcal{p}\right)}^{6}4s\to {\left(3\mathcal{p}\right)}^{5}{\left(4s\right)}^{2}{\phantom{\rule{0.2em}{0ex}}}^{2}{P}_{\frac{3}{2},\frac{1}{2}}$ transitions. This spectral region was studied photoelectrically at a bandwidth of 0.37 Å and photographically at 0.075 Å. Curves and tables are presented of the atomic absorption cross sections of potassium versus energy from the series limit to 580 Å, and a comparison is made between these results and recent theoretical estimates. An attempt was made to fit Fano–Beutler profiles to the measured line shapes of the ${\left(3\mathcal{p}\right)}^{6}4s\to {\left(3\mathcal{p}\right)}^{5}{\left(4s\right)}^{2}{-}^{2}{P}_{\frac{3}{2},\frac{1}{2}}$ transitions and the resulting line-shape parameters are given. The sum of the oscillator strengths of these transitions was found to be 0.147.

© 1967 Optical Society of America

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