  Photoionization of Kr$^+$ ions was studied in the energy range from 23.3 eV
to 39.0 eV at a photon energy resolution of 7.5 meV. Absolute measurements were
performed by merging beams of Kr$^+$ ions and of monochromatized synchrotron
undulator radiation. Photoionization (PI) of this Br-like ion is characterized
by multiple Rydberg series of autoionizing resonances superimposed on a direct
photoionization continuum. Resonance features observed in the experimental
spectra are spectroscopically assigned and their energies and quantum defects
tabulated. The high-resolution cross-section measurements are benchmarked
against state-of-the-art theoretical cross-section calculations from the
Dirac-Coulomb R-matrix method.
