Photoionisation of Cl${}^{+}$ from the $3s^{2}3p^4{}^3{P}_{2,1,0}$ and the$3s^{2}3p^4{}^1{D}_2{,}^1{S}_0$ states in the energy range 19 - 28 eV

Abstract

Absolute photoionisation cross sections for the Cl${}^{+}$ ion in its ground and the metastable states; $3s^{2}3p^4{}^3{P}_{2,1,0}$, and $3s^{2}3p^4{}^1{D}_2,{}^1{S}_0$, were measured recently at the Advanced Light Source ALS) at Lawrence Berkeley National Laboratory using the merged beams photon-ion technique at an photon energy resolution of 15 meV in the energy range 19 -- 28 eV. These measurements are compared with large-scale Dirac Coulomb {\it R}-matrix calculations in the same energy range. Photoionisation of this sulphur-like chlorine ion is characterized by multiple Rydberg series of autoionizing resonances superimposed on a direct photoionisation continuum. A wealth of resonance features observed in the experimental spectra are spectroscopically assigned and their resonance parameters tabulated and compared with the recent measurements. Metastable fractions in the parent ion beam are determined from the present study. Theoretical resonance energies and quantum defects of the prominent Rydberg series $3s^{2}3p^{3}nd$, identified in the spectra as $3p\to nd$ transitions are compared with the available measurements made on this element. Weaker Rydberg series $3s^{2}3p^{3}ns$, identified as $3p\to ns$ transitions and window resonances $3s3p^4{(}^{4}P)np$ features, due to $3s\to np$ transitions are also found in the spectra.

12 pages, 5 figures, 3 tables., accepted for publication in MNRAS. arXiv admin note: text overlap with arXiv:1412.8715

References in corpus (6)

• The Abundances of Light Neutron-Capture Elements in Planetary Nebulae II. s-process Enrichments and Interpretation
• Photoionization Cross-Sections for the trans-iron element Se${}^{+}$ from 18 eV to 31 eV
• Photoionization cross section calculations for the halogen-like ions Kr${}^{+}$ and Xe${}^{+}$
• Photoionization of the $3s^{2}3p^4{}^{3}P$ and the $3s^{2}3p^4{}^{1}D,{}^{1}S$ states of sulfur: experiment and theory
• Photoionization of the valence shells of the neutral tungsten atom
• Valence-shell photoionization of Ag-like Xe${}^{7+}$ ions : experiment and theory

Cited by in corpus (1)

• Photoionisation of Ca${}^{+}$ ions in the valence-energy region 20$\sim$eV~--~56$\sim$eV : experiment and theory