Valence and L-shell photoionization of Cl-like Argon using R-matrix techniques

Abstract

Photoionization cross sections are obtained using the relativistic Dirac Atomic R-matrix Codes (DARC) for all valence and L-shell energy ranges between 27-270eV. A total of 557 levels arising from the dominant configurations 3s${}^2$3p${}^4$, 3s3p${}^5$, 3p${}^6$, 3s${}^2$3p${}^3$[3d, 4s, 4p], 3p${}^5$3d, 3s${}^2$3p${}^2$3d${}^2$, 3s3p${}^4$3d, 3s3p${}^3$3d${}^2$ and 2s${}^2$2p${}^5$3s${}^2$3p${}^5$ have been included in the target wavefunction representation of the Ar III ion, including up to 4p in the orbital basis. We also performed a smaller Breit-Pauli (BP) calculation containing the lowest 124 levels. Direct comparisons are made with previous theoretical and experimental work for both valence shell and L-shell photoionization. Excellent agreement was found for transitions involving the ${}^2$P${}^{\mathrm{o}}$ initial state to all allowed final states for both calculations across a range of photon energies. A number of resonant states have been identified to help analyze and explain the nature of the spectra at photon energies between 250 and 270eV.

References in corpus (3)

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• [ArIII]/[OIII] and [SIII]/[OIII]: well-behaved oxygen abundance indicators for HII regions and star forming galaxies

Cited by in corpus (5)

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• Photoionization of tungsten ions: experiment and theory for W${}^{4+}$
• Photoionisation of Ca${}^{+}$ ions in the valence-energy region 20$\sim$eV~--~56$\sim$eV : experiment and theory