Abstract
Experimental techniques for photoionisation measurements on atomic ions are described, and recent progress in the measurement of absolute photoionisation cross sections is reviewed. The complementary contributions of the two main experimental methods, merged beam and dual laser produced plasma (DLPP), pointing out both the problems and advantages of the two different techniques, are discussed. Examples are given where absolute measurements have helped to resolve uncertainties in earlier experiments, together with the assistance of theoretical calculations. Future developments are indicated, particularly in the areas of multiply charged ions and negative ions.
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