K-shell dielectronic resonances in photoabsorption: differential oscillator strengths for Li-like C IV, O VI, and Fe XXIV

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dc.creatorNahar, Sultana N.
dc.creatorPradhan, Anil K.
dc.creatorZhang, Hong Lin
dc.date2001-02-06
dc.date2001-03-21
dc.date.accessioned2026-07-07T12:00:45Z
dc.date.available2026-07-07T12:00:45Z
dc.descriptionRecently X-ray photoabsorption in KLL resonances of O VI was predicted [Pradhan, Astrophys.J. Lett. 545, L165 (2000)], and detected by the Chandra X-ray Observatory [Lee et al, Astrophys. J. {\it Lett.}, submitted]. The required resonance oscillator strengths f_r, are evaluated in terms of the differential oscillator strength df/de that relates bound and continuum absorption. We present the f_r values from radiatively damped and undamped photoionization cross sections for Li-like C,O, and Fe calculated using relativistic close coupling Breit-Pauli R-matrix method. The KLL resonances of interest here are: 1s2p (^3P^o) 2s [^4P^o_{1/2,3/2}, ^2P^o_{1/2,3/2}] and 1s2p (^1P^o) 2s [^2P^o_{1/2,3/2}]. The KLL photoabsorption resonances in Fe XXIV are fully resolved up to natural autoionization profiles for the first time. It is demonstrated that the undamped f_r independently yield the resonance radiative decay rates, and thereby provide a precise check on the resolution of photoionization calculations in general. The predicted photoabsorption features should be detectable by the X-ray space observatories and enable column densities in highly ionized astrophysical plasmas to be determined from the calculated f_r. The dielectronic satellites may appear as redward broadening of resonances lines in emission and absorption.
dc.description9 pages, 2 figurs, Phys. Rev. A, Rapid Communication (submitted)
dc.identifierhttps://arxiv.org/abs/astro-ph/0102107
dc.identifierhttp://arxiv.org/abs/astro-ph/0102107
dc.identifierPhys.Rev.A63:060701,2001
dc.identifierdoi:10.1103/PhysRevA.63.060701
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206889
dc.subjectAstrophysics
dc.subjectAtomic Physics
dc.titleK-shell dielectronic resonances in photoabsorption: differential oscillator strengths for Li-like C IV, O VI, and Fe XXIV
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