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Absolute photoionization cross-section measurements are reported for Se+ inthe photon energy range 18.0-31.0 eV, which spans the ionization thresholds ofthe 4S_{3/2} ground state and the low-lying 2P_{3/2,1/2} and 2D_{5/2,3/2}metastable states. The measurements were performed using the Advanced LightSource synchrotron radiation facility. Strong photoexcitation-autoionizationresonances due to 4p-->nd transitions are seen in the cross-section spectrumand identified with a quantum-defect analysis.

Experimental Photoionization Cross-Section Measurements in the Ground and Metastable State Threshold Region of Se+