K-Shell Photoionization of B-like Oxygen (O${}^{3+}$) Ions: Experiment and Theory

Abstract

Absolute cross sections for the {\it K}-shell photoionization of boron-like (B-like) O${}^{3+}$ ions were measured by employing the ion-photon merged-beam technique at the SOLEIL synchrotron-radiation facility in Saint-Aubin, France. High-resolution spectroscopy with E/$\Delta$E $\approx$ 5000 ($\approx$ 110 meV, FWHM) was achieved with photon energy from 540 eV up to 600 eV. Several theoretical approaches, including R-Matrix, Multi-Configuration Dirac-Fock and Screening Constant by Unit Nuclear Charge were used to identify and characterize the strong 1s $\to$ 2p and the weaker 1s $\to$ 3p resonances observed in the {\it K}-shell spectra of this ion. The trend of the integrated oscillator strength and autoionisation width (natural line width) of the strong $1s\to 2p$ resonances along the first few ions of the B-like sequence is discussed.

arXiv comment23 pages, 5 figures, 5 tables, accepted for publication in J. Phys. B. arXiv admin note: text overlap with arXiv:1402.0519

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