X-ray absorption via K-alpha resonance complexes in oxygen ions

Abstract

The K-alpha resonance complexes in oxygen ions O I - O VI are theoretically computed and resonance oscillator strengths and wavelengths are presented. The highly resolved photoionization cross sections, with relativistic fine structure, are computed in the coupled channel approximation using the Breit-Pauli R-matrix method. A number of strong K-alpha resonances are found to be appreciable, with resonance oscillator strengths f_r > 0.1. The K-alpha resonance wavelengths of O I-O VI lie in a relatively narrow wavelength range 22 - 23.5 A, and the X-ray opacity in this region should therefore be significantly affected by K --> L transitions in oxygen. The results should be useful in the interpretation of soft X-ray spectra observed from Chandra and XMM-Newton.

Monthly Notices of Roy. Astro. Soc. (in press), 10 pgs. 1 figure

References in corpus (12)

• Revealing the Dusty Warm Absorber in MCG--6-30-15 with the Chandra HETG
• X-ray spectroscopy of NGC 5548
• Soft X-ray emission lines from a relativistic accretion disk in MCG -6-30-15 and Mrk 766
• Multi-wavelength study of the Seyfert 1 galaxy NGC 3783 with XMM-Newton
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• E1 transitions between states with n = 1 to 6 in helium-like carbon, nitrogen, oxygen, neon, silicon, and argon
• The K-alpha complex of He-like iron with dielectronic satellites
• X-Ray Photoabsorption in KLL Resonances of O VI And Abundance Analysis
• Electron impact excitation of helium-like oxygen up to n = 4 levels including radiation damping
• K-shell dielectronic resonances in photoabsorption: differential oscillator strengths for Li-like C IV, O VI, and Fe XXIV

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