K-shell photoionization of O4 + and O5 + ions: Experiment and theory
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Date
2017-03-11Author
McLaughlin, B. M.Bizau, J. M.
Cubaynes, D.
Guilbaud, S.
Douix, S.
Al Shorman, M. M.
El Ghazaly, M. O.A.
Sakho, I.
Gharaibeh, M. F.
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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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