Open AccessX‐ray absorption via Kα resonance complexes in oxygen ions
Author(s) -
Pradhan Anil K.,
Chen Guo Xin,
Delahaye Franck,
Nahar Sulta.,
Oelgoetz Justin
Publication year - 2003
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2003.06513.x
Subject(s) - physics , photoionization , resonance (particle physics) , opacity , ion , atomic physics , spectral line , wavelength , absorption (acoustics) , shape resonance , oxygen , absorption spectroscopy , ionization , optics , astronomy , quantum mechanics
The Kα 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 Kα resonances are found to be appreciable, with resonance oscillator strengths f r > 0.1 . The Kα resonance wavelengths of O i –O vi lie in the relatively narrow wavelength range 22–23.5 Å, 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 .