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Title: K -shell photoionization of O 4+ and O 5+ ions: experiment and theory

Abstract

We report that 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+.

Authors:
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [7];  [8]
  1. Queen's Univ., Belfast, Northern Ireland (United Kingdom). School of Mathematics and Physics, Centre for Theoretical Atomic and Molecular Physics (CTAMOP); Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States). Inst. for THeoretical Atomic and Molecular Physics (ITAMP)
  2. Synchrotron SOLEIL- L'Orme des Merisiers, Gif-sur-Yvette (France); Univ. Paris-Sud, Orsay (France). Univ. Paris-Saclay, Inst. des Sciences Moleculaires d'Orsay
  3. Univ. Paris-Sud, Orsay (France). Univ. Paris-Saclay, Inst. des Sciences Moleculaires d'Orsay
  4. Synchrotron SOLEIL- L'Orme des Merisiers, Gif-sur-Yvette (France)
  5. Tafila Technical Univ., Tafila (Jordan). Applied Physics Dept., Faculty of Science
  6. California Inst. of Technology (CalTech), La Canada Flintridge, CA (United States). Jet Propulsion Lab., Astrophysics and Space Sciences Section
  7. Univ. Assane Seck of Ziguinchor (Senegal). UFR of Sciences and Technologies, Dept. of Physics
  8. Qatar Univ. (Qatar). Dept. of Mathematics, Statistics, and Physics
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE
OSTI Identifier:
1526291
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 465; Journal Issue: 4; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; atomic data; atomic processes

Citation Formats

McLaughlin, B. M., Bizau, J. -M., Cubaynes, D., Guilbaud, S., Douix, S., Shorman, M. M. Al, Ghazaly, M. O. A. El, Sakho, I., and Gharaibeh, M. F. K -shell photoionization of O 4+ and O 5+ ions: experiment and theory. United States: N. p., 2016. Web. doi:10.1093/mnras/stw2998.
McLaughlin, B. M., Bizau, J. -M., Cubaynes, D., Guilbaud, S., Douix, S., Shorman, M. M. Al, Ghazaly, M. O. A. El, Sakho, I., & Gharaibeh, M. F. K -shell photoionization of O 4+ and O 5+ ions: experiment and theory. United States. https://doi.org/10.1093/mnras/stw2998
McLaughlin, B. M., Bizau, J. -M., Cubaynes, D., Guilbaud, S., Douix, S., Shorman, M. M. Al, Ghazaly, M. O. A. El, Sakho, I., and Gharaibeh, M. F. Tue . "K -shell photoionization of O 4+ and O 5+ ions: experiment and theory". United States. https://doi.org/10.1093/mnras/stw2998. https://www.osti.gov/servlets/purl/1526291.
@article{osti_1526291,
title = {K -shell photoionization of O 4+ and O 5+ ions: experiment and theory},
author = {McLaughlin, B. M. and Bizau, J. -M. and Cubaynes, D. and Guilbaud, S. and Douix, S. and Shorman, M. M. Al and Ghazaly, M. O. A. El and Sakho, I. and Gharaibeh, M. F.},
abstractNote = {We report that 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+.},
doi = {10.1093/mnras/stw2998},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 465,
place = {United States},
year = {Tue Nov 22 00:00:00 EST 2016},
month = {Tue Nov 22 00:00:00 EST 2016}
}

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Works referencing / citing this record:

K-shell photoabsorption and photoionization of trace elements: II. Isoelectronic sequences with electron number 12 ≤ N ≤ 18
journal, August 2017


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K-shell photoabsorption and photoionization of trace elements: III. Isoelectronic sequences with electron number 19 ≤ N ≤ 26
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