| Autor: |
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. |
| Předmět: |
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| Zdroj: |
Monthly Notices of the Royal Astronomical Society; Mar2017, Vol. 465 Issue 4, p4690-4702, 13p |
| Abstrakt: |
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 +. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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