Photoionization of the Ne-like ${\text{Si}}^{4+}$ ion in ground and metastable states in the 110--184-eV photon energy range

Photoionization of the Ne-like ${Si}^{4 +}$ ion in ground and metastable states in the 110–184-eV photon energy range

J.-M. Bizau, J.-P. Mosnier, E. T. Kennedy, D. Cubaynes, F. J. Wuilleumier, C. Blancard, J.-P. Champeaux, and F. Folkmann

Phys. Rev. A 79, 033407 – Published 16 March 2009

Abstract

We present measurements of the absolute photoionization cross section of the neonlike ${Si}^{4 +}$ ion over the 110–184 eV photon energy range. The measurements were performed using two independent merged-beam setups at the super-ACO and ASTRID synchrotron-radiation facilities, respectively. Signals produced in the photoionization of the $2 p$ subshell of the ${Si}^{4 +}$ ion both from the $2 p^{6} {{}^{1}S}_{0}$ ground state and the $2 p^{5} 3 s {{}^{3}P}_{0, 2}$ metastable levels were observed. Calculations of the $2 p$ photoionization cross sections were carried out using a multi-configuration Dirac-Fock code. They give results in good agreement with the measured spectra. Comparison with other available theoretical results is also presented.

Received 12 January 2009

DOI:https://doi.org/10.1103/PhysRevA.79.033407

Authors & Affiliations

J.-M. Bizau^1,*, J.-P. Mosnier², E. T. Kennedy², D. Cubaynes¹, F. J. Wuilleumier¹, C. Blancard³, J.-P. Champeaux^3,†, and F. Folkmann⁴

¹Laboratoire d'Interaction des rayons X avec la Matière, Bât. 350, Université Paris-Sud, F-91405 Orsay Cedex, France
²National Centre for Plasma Science and Technology, School of Physical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland
³CEA, DAM, DIF, F-91297 Arpajon, France
⁴Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark

^*Corresponding author. jean-marc.bizau@u-psud.fr
^†Present address: IRSAMC LCAR, UMR 5589—Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse CEDEX, France

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Vol. 79, Iss. 3 — March 2009

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Physical Review A

covering atomic, molecular, and optical physics and quantum information

Photoionization of the Ne-like ${Si}^{4 +}$ ion in ground and metastable states in the 110–184-eV photon energy range

J.-M. Bizau, J.-P. Mosnier, E. T. Kennedy, D. Cubaynes, F. J. Wuilleumier, C. Blancard, J.-P. Champeaux, and F. Folkmann

Phys. Rev. A 79, 033407 – Published 16 March 2009

Abstract

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Physical Review A

covering atomic, molecular, and optical physics and quantum information

Photoionization of the Ne-like Si4+ ion in ground and metastable states in the 110–184-eV photon energy range

J.-M. Bizau, J.-P. Mosnier, E. T. Kennedy, D. Cubaynes, F. J. Wuilleumier, C. Blancard, J.-P. Champeaux, and F. Folkmann

Phys. Rev. A 79, 033407 – Published 16 March 2009

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Photoionization of the Ne-like ${Si}^{4 +}$ ion in ground and metastable states in the 110–184-eV photon energy range