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

Abstract

Absolute photoionization cross-section measurements are reported for Se+ in the photon energy range 18.0-31.0 eV, which spans the ionization thresholds of the 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 Light Source synchrotron radiation facility. Strong photoexcitation-autoionization resonances due to 4p-->nd transitions are seen in the cross-section spectrum and identified with a quantum-defect analysis.

arXiv comment10 pages, 2 figures, accepted for publication in J. Phys. B: At. Mol. Opt. Phys

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