Photoionization Cross-Sections for the trans-iron element Se${}^{+}$ from 18 eV to 31 eV

Abstract

Absolute photoionization cross-section calculations are presented for Se${}^{+}$ using large-scale close-coupling calculations within the Breit-Pauli and Dirac-Coulomb R-matrix approximations. The results from our theoretical work are compared with recent measurements made at the Advanced Light Source (ALS) radiation facility in Berkeley, California, USA. We report on results for the photon energy range 18.0 eV -- 31.0 eV, which spans the ionization thresholds of the ${}^4{\mathrm{S}}_{3/2}^{\mathrm{o}}$ ground state and the low-lying ${}^2{\mathrm{D}}_{5/2,3/2}^{\mathrm{o}}$ and ${}^2{\mathrm{P}}_{3/2,1/2}^{\mathrm{o}}$ metastable states. Metastable fractions are inferred from our present work. Resonance energies and quantum defects of the prominent Rydberg resonances series identified in the spectra are compared for the $4p\to \mathrm{nd}$ transitions with the recent ALS experimental measurements made on this complex trans-iron element.

Accepted for publication. arXiv admin note: text overlap with arXiv:1011.6312 by other authors

References in corpus (2)

• The Abundances of Light Neutron-Capture Elements in Planetary Nebulae II. s-process Enrichments and Interpretation
• Photoionization cross section calculations for the halogen-like ions Kr${}^{+}$ and Xe${}^{+}$

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