Parts-per-million-accurate determination of the K$\hat{I}\pm$ photoionization resonance of Be-like oxygen with resolution of its ${}^{16}$O-${}^{18}$O isotopic shift

Jonas Danisch, Marc Botz, Chintan Shah +15

We determine with high accuracy the energy of the inner-shell transition $1s^{2}2s^2{}^1{\mathrm{S}}_0\to 1s2s^{2}2p_{3/2}{}^1{\mathrm{P}}_1$ ${}^{16}{\mathrm{O}}_{K\hat{I}\pm }^{4+}$ a…