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In a joint experimental and theoretical endeavour, photoionization ofmetastable C4+(1s 2s 3S1) ions via intermediate levels with hollow,double-K-vacancy configurations 2s2p, 2s3p, 2p3s, 2p3d, 2s4p, 2p4s and 2p4d hasbeen investigated. High-resolution photon-ion merged-beams measurements werecarried out with the resolving power reaching up to 25,000 which is sufficientto separate the leading fine-structure components of the 2s2p 3P term.Many-body perturbation theory was employed to determine level-to-level crosssections for K-shell excitation with subsequent autoionization. The resonanceenergies were calculated with inclusion of electron correlation and radiativecontributions. Their uncertainties are estimated to be below $\pm$1 meV.Detailed balance confirms the present photoionization cross-section results bycomparison with previous dielectronic-recombination measurements. The highaccuracy of the theoretical transition energies together with the presentexperimental results qualify photoabsorption resonances in heliumlike ions asnew, greatly improved energy-reference standards at synchrotron radiationfacilities.

Photoionization of metastable heliumlike C4+(1s 2s 3S1) ions: Precision study of intermediate doubly excited states