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K-Shell Absorption and Emission Calculations Tom Gorczyca Western Michigan University

K-Shell Absorption and Emission Calculations Tom Gorczyca Western Michigan University. X-Ray Photoabsorption of O and Ne Orbital Relaxation Auger Broadening of Resonances Elemental Abundances in the ISM. High Accuracy Atomic Physics in Astronomy ITAMP 2006.

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K-Shell Absorption and Emission Calculations Tom Gorczyca Western Michigan University

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  1. K-Shell Absorption and Emission CalculationsTom GorczycaWestern Michigan University X-Ray Photoabsorption of O and Ne Orbital Relaxation Auger Broadening of Resonances Elemental Abundances in the ISM High Accuracy Atomic Physics in Astronomy ITAMP 2006 Fluorescence/Auger Decay of Li-like → F-like Ions Deficiencies in Existing Data Base Importance of Higher-Order Effects (CI, S.O., etc.) Breakdown of the Configuration-Average Approximation

  2. Inner-Shell Vacancy:Orbital Relaxation O I (1s22s22p4) O II* (1s2s22p4) 2p - O II* 2p - O I Really Need Pseudoorbitals and Additional Configurations for Relaxation Effects Requires Pseudoresonance Removal (Gorczyca et al. PRA, 1995)

  3. Participator Auger Decay Spectator Auger Decay Standard (solid) vs. Optical Potential (dashed) R-matrix Theory vs. Experiment

  4. Entered into CHANDRA Database (1998) Experiment Experiment vs.R-matrix No Relaxation of Orbitals: Energy Positions Too High 1s→2p 1s→3p No Spectator Auger Decay: Unphysically Narrow (Unresolvable) Resonances O2(1s→π*)

  5. Experiment vs.Optical PotentialR-matrix Relaxation and Spectator Auger Decay Included 1s→2p 1s→3p O2(1s→π*)

  6. Photoabsorption of Neon Ions Experimental results only exist for Ne I Independent Model (IP) results do not include resonances Ne I cannot absorb 1s→2p photons Ne II and higher show strong absorption features

  7. NO = 1018-1019cm-2 Intensity: I = I0 e-σN Column Density: N = ∫ n dx

  8. Kaastra & Mewe (1993) Gorczyca et al. Ap.J. (2003) Comparison of Be-Like Fluorescence Results Explicit calculations for neutrals only E. J. McGuire (1969,1970,1971,1972) Explicit calculations performed for each member of the sequence using AUTOSTRUCTURE H-like Z-scaling for higher members Multiconfiguration Intermediate Coupling Single-configuration LS coupling Ratio of Configuration Averages Configuration Average of Ratios

  9. Fluorescence Yield Results

  10. Fluorescence Yields of Li-like 1s2s(2) Ions

  11. Strong LSJ Dependence of Fluorescence Yields: Breakdown of the Configuration-Average Approximation Astrophysical Journal Letters, in press (2006)

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