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Two-photon double-resonant photoionization of Ar and Xe to their autoionizing states lying between the 2 P 3/2 and 2 P 1/2 ionic thresholds was carried out with the combination of a laser system and VUV synchrotron radiation from the storage ring at NSRRC. Tuning this radiation of narrow width to a selected Rydberg state was followed by excitation to even-parity levels...