Abstract
Increased dispersion and resolving power have made possible a revision and extension of the work of previous investigators on the spectra of krypton in the extreme ultraviolet. Lists of classified lines are given for Kr I, Kr II and Kr III, and for one multiplet of Kr IV, in the range from λ2000 to λ500. No new lines were found for Kr I, but the accuracy of the measurements is considerably improved. 82 lines of Kr II are given including 31 lines newly identified. 138 lines of Kr III have been identified in collaboration with C. J. Humphreys. The consolidated term table for Kr III is included in the previous paper.

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