Abstract
Transition probabilities of three magnetic dipole $(M1)$ transitions in multiply charged ions of potassium have been measured using the Livermore electron beam ion trap EBIT-2. Our results for the atomic level lifetimes are $4.44\ifmmode\pm\else\textpm\fi{}0.10 \mathrm{ms}$ for K XI (F-like) ${2s}^{2}{2p}^{5}{}^{2}{P}_{1/2}^{o},$ $4.47\ifmmode\pm\else\textpm\fi{}0.10 \mathrm{ms}$ for K XV (B-like) ${2s}^{2}2p{}^{2}{P}_{3/2}^{o},$ and $7.6\ifmmode\pm\else\textpm\fi{}0.5 \mathrm{ms}$ for K XVI (Be-like) $2s2p{}^{3}{\mathrm{P}}_{2}^{o}.$ The results confirm the accuracy of most predictions to within 3% of ground-state and 7% of excited-state transitions.
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