Single photoionization of the Zn II ion in the photon energy range 17.5 to 90.0 eV: experiment and theory

Abstract

Measurements of the single photoionization cross section of Cu-like Zn${}^{+}$ ions are reported in the energy (wavelength) range 17.5 eV (709 Å) to 90 eV (138 Å). The measurements on this {\it trans}-Fe element were performed at the Advanced Light Source synchrotron radiation facility in Berkeley, California at a photon energy resolution of 17 meV using the photon-ion merged-beams end-station. Below 30 eV the spectrum is dominated by excitation autoionizing resonance states. The experimental results are compared with large-scale photoionization cross-section calculations performed using a Dirac-Coulomb $R$-matrix approximation. Comparison are made with previous experimental studies, resonance states are identified and contributions from metastable states of Zn${}^{+}$ determined.

15 pages, 5 figures, 7 tables, accepted for publication in MNRAS

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