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A different technique is used to study the radiative decay of a metastablestate in multiply ionized atoms. With use of a unitary Penning trap toselectively capture Kr$^{17+}$ ions from an ion source at NIST, the decay ofthe 3d $^2D_{5/2}$ metastable state is measured in isolation at low energy,without any active cooling. The highly ionized atoms are trapped in the finestructure of the electronic ground configuration with an energy spread of 4(1)eV, which is narrower than within the ion source by a factor of about 100. Byobserving the visible 637 nm photon emission of the forbidden transition fromthe 3d $^2D_{5/2}$ level to the ground state, we measured its radiativelifetime to be $\tau=$ 24.48 ms +/- 0.28(stat.) ms +/- 0.14(syst.) ms.Remarkably, various theoretical predictions for this relativistic Rydberg atomare in agreement with our measurement at the 1% level.

Measurement of the Kr XVIII 3d $^2D_{5/2}$ lifetime at low energy in a unitary Penning trap