Abstract
Using 10.7 m and 3 m normal-incidence vacuum ultraviolet spectrographs, we investigated the spectrum of singly ionized potassium in the regions 495–612 Å and 1247–2150 Å. More than 120 new K II lines were identified. The previous study on this spectrum was revised and extended. All levels of the 3p5 4f and 5f configurations as well as the levels of 3p5 6f based on the 3p5 2P3/2 core state have now been located. Several new levels of 3p5 3d were also located. The ionization limit was determined from the 3p5nf 1.5[4.5]5 (n=4–6) series as 255072.8±1.5 cm−1 (31.6250±0.0002 eV).
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