State-resolved cross sections for the dielectronic recombination of hydrogenlike oxygen ions with free electrons have been measured for the first time using the electron cooling device in the heavy-ion Test Storage Ring in Heidelberg. Energies and cross sections for individual terms of the configuration 2/2/' were determined. Two-electron resonances llnl' with n > 3 contribute 90% to the total dielectronicrecombination cross section. Energies and cross sections are in reasonable agreement with available calculations.PACS numbers: 34.80.Kw

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