Abstract
Detailed measurements of the absolute photoabsorption cross section of atomic calcium between 2028 and 1753 \AA{} and 1589 and 1424 \AA{} are presented. Structure is displayed in the absorption cross section below 1589 \AA{}, confirming previous theoretical predictions of autoionization in this region. However, the observed peak magnitudes are an order of magnitude smaller than suggested by theory. A theoretical analysis has succeeded in achieving better agreement between experiment and the two-channel quantum-defect theory for the $^{1}S_{0}\ensuremath{\rightarrow}^{1}P_{1}^{0}$ transitions in the 2028-1753-\AA{} region, both in the magnitude and in the general shape of the absorption profile.
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