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We report on experimental and theoretical results for the photoionization ofAg-like xenon ions, Xe$^{7+}$, in the photon energy range 95 to 145~eV. Themeasurements were carried out at the Advanced Light Source at an energyresolution of $\Delta$E = 65 meV with additional measurements made at $\Delta$E= 28 meV and 39 meV. Small resonance features below the ground-state ionizationthreshold, at about 106 eV, are due to the presence of metastable Xe$^{7+}(4d^{10} 4f~^2{\rm F}^{\circ}_{5/2,7/2})$ ions in the ion beam. On the basis ofthe accompanying theoretical calculations using the Dirac Atomic R-matrix Codes(DARC), an admixture of only a few percent of metastable ions in the parent ionbeam is inferred, with almost 100\% of the parent ions in the $(4d^{10}5s~^2{\rm S_{1/2}})$ ground level. The cross-section is dominated by a verystrong resonance associated with $4d \rightarrow 5f$ excitation and subsequentautoionization. This prominent feature in the measured spectrum is the$4d^95s5f ~^2{\rm P}^{\circ}$ resonance located at (122.139 $\pm$ 0.01)~eV. Anabsolute peak cross-section of 1.2 Gigabarns was measured at 38 meV energyresolution. The experimental natural width $\Gamma$ = 76 $\pm$ 3 meV of thisresonance compares well with the theoretical estimate of 88 meV obtained fromthe DARC calculation with 249 target states. Given the complexity of thesystem, overall satisfactory agreement between theory and experiment isobtained for the photon energy region investigated.

Valence-shell photoionization of Ag-like Xe$^{7+}$ ions : experiment and theory