K-shell photoionization of O4 + and O5 + ions: Experiment and theory

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Abstract

Absolute cross-sections for the K-shell photoionization of Be-like (O4 +) and Li-like (O5 +) atomic oxygen ions were measured for the first time (in their respective K-shell regions) by employing the ion-photon merged-beam technique at the SOLEIL synchrotron-radiation facility in Saint-Aubin, France. High-resolution spectroscopy with E/ΔE ≈ 3200 (≈170 meV, full width at half-maximum) was achieved with photon energy from 550 to 670 eV. Rich resonance structure observed in the experimental spectra is analysed using the R-matrix with pseudo-states (RMPS) method. Results are also compared with the screening constant by unit nuclear charge (SCUNC) calculations. We characterize and identify the strong 1s → 2p resonances for both ions and the weaker 1s→np resonances (n ≥ 3) observed in the K-shell spectra of O4 +.

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McLaughlin, B. M., Bizau, J. M., Cubaynes, D., Guilbaud, S., Douix, S., Al Shorman, M. M., … Gharaibeh, M. F. (2017). K-shell photoionization of O4 + and O5 + ions: Experiment and theory. Monthly Notices of the Royal Astronomical Society, 465(4), 4690–4702. https://doi.org/10.1093/mnras/stw2998

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