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28 March 2024
 
  » arxiv » astro-ph/0302238

 Article overview


X-ray absorption via K-alpha resonance complexes in oxygen ions
Anil K. Pradhan ; Guo Xin Chen ; Franck Delahaye ; Sultana N. Nahar ; Justin Oelgoetz ;
Date 12 Feb 2003
Journal Mon.Not.Roy.Astron.Soc. 341 (2003) 1268
Subject astro-ph
AffiliationDept. of Astronomy, Ohio State), Justin Oelgoetz (Dept. of Chemistry, Ohio State
AbstractThe 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.
Source arXiv, astro-ph/0302238
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