Loading...
Please wait, while we are loading the content...
Similar Documents
X-Ray Photoabsorption in KLL Resonances of O VI And Abundance Analysis
| Content Provider | Semantic Scholar |
|---|---|
| Author | Pradhan, Anil K. |
| Copyright Year | 2000 |
| Abstract | It is shown that photoabsorption via autoionizing resonances may be appreciable and used for abundance analysis. Analogous to spectral lines, the ‘resonance oscillator strength’ f̄r may be defined and evaluated in terms of the differential oscillator strength df/dǫ that relates bound and continuum absorption. X-ray photoabsorption in KLL (1s2s2p) resonances of O VI is investigated using highly resolved relativistic photoionization cross sections with fine structure. It is found that f̄r is comparable to that for UV dipole transition in O VI (2s 2p) and the X-ray (1s S0 − 1s2p P o 1 ) transition in O VII. The dominant O VI(KLL) components lie at λλ 22.05 and 21.87 Å. These predicted absorption features should be detectable by the Chandra X-Ray Observatory (CXO) and the X-Ray Multi-Mirror Mission (XMM). The combined UV/X-ray spectra of O VI/O VII should yield valuable information on the ionization structure and abundances in sources such as the ‘warm absorber’ region of active galactic nuclei and the hot intergalactic medium. Some general implications of resonant photoabsorption are addressed. Subject headings: X-Rays : general — Ultraviolet : general — atomic processes — line: formation, identification — radiation mechanisms: thermal |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0010255v2.pdf |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0010255v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Active galactic nucleus Computed Tomography Scanning Systems Cross section (geometry) Diagnostic radiologic examination Maxillary right second molar prosthesis Medical Subject Headings Oscillator Device Component Photoabsorption [MoA] Photoelectric effect Photoelectrochemical process Radiation Relativistic wave equations Resonance Supernumerary maxillary right second molar Supernumerary maxillary right third molar Triune continuum paradigm Vii X-Ray (Amazon Kindle) |
| Content Type | Text |
| Resource Type | Article |
