1. Dielectronic Recombination and Inner-Shell Photoabsorption
Work Week and Workshop 2012
Dielectronic Recombination and
Inner-Shell Photoabsorption
Tom Gorczyca
Oleg Zatsarinny, Jun Fu, Dragan Nikolic,
Fatih Hasoglu, Shahin Abdel Naby
1/2/2019

2. DR Project N. R. Badnell M. G. O’Mullane H. P. Summers M. S. PindzolaUK
M. S. Pindzola
S. D. Loch
J. Colgan (LANL)
D. M. Mitnik
T. W. Gorczyca
K. T. Korista
M. A. Bautista
O. Zatsarinny (DU)
D. Nikolić (NINT)
J. Fu
Shahin Abdel Naby
DR Project
Z. Altun
A. Yumak
Turkey
1/2/2019

3. Status of the DR Project
Level-resolved DR rate coefficients for H-like through Mg-like
isoelectronic sequences have been computed.
The state-of-the-art AUTOSTRUCTURE package has been used.
For each sequence, calculations were performed up to Zn and we included
other heavy ions such as Kr, Mo, and Xe.
The Controlled Fusion Atomic Data Center
ADAS Atomic data and analysis structure
1/2/2019

4. Methodology
1/2/2019

5. Updated DR Data
Si-like and higher isoelectronic sequences are still needed.
CHIANTI- an atomic database for emission lines are updated1.
For Fe-ions, the work of Badnell and coworkers up through Mg-like.
Fe from Badnell2 work.
_________________________
1K. P. Dere et al, A&A 498, 915 (2009)
2N. R. Badnell, ApJ 651, L73 (2006)
1/2/2019

6. 1/2/2019

7. 1/2/2019

8. DR Rate Coefficient for S3+
At low T, the contributions from 3s23pnl core relaxation is forbidden in
LS-coupling.
Why DR for IC-coupling is reduced?
1/2/2019

9. 3s → 3p excitation
n=36 IC
The reduction in the DR occurs at n=36 for both 3s3p2(2P1/2, 3/2)nℓ which is reflected in DR.
Such reduction doesn’t exist in LS coupling
3s3p2 2Pnℓ LS
FWHM=1.2 meV
1/2/2019

10. DR Rate Coefficient for Fe13+
kT║ = 0.09meV
____ Theory
____ TSR Experiment1
3s23p 2P_{3/1}nl, 3s3p2 4P_{3/2}9f, 3s3p3d5g, 3p23dnl, 3s3d2nl
1 E. W. Schmidt et al, ApJ 641, L (2006).
1/2/2019
ncut ≤ 95, ℓ ≤ 8

11. DR Rate Coefficient for Al-like Ions
1/2/2019

12. Zn17+
P2+
S3+
Si+
Total ground state RR rate coefficients for the Al-like isoelectronic sequence using AUTOSTRUCTURE package. Curves from Si to Zn are shown from left to right.
1/2/2019

13. K-Shell Photoabsorption
R-Matrix (nonperturbative method)
Include spectator Auger decay broadening effects
T. W. Gorczyca and F. Robicheaux, Phys. Rev. A 60, 1215(1999)
Excellent agreement with synchrotron experiments on neutral atoms
Ar T. W. Gorczyca and F. Robicheaux, Phys. Rev. A 60, 1215(1999)
O T. W. Gorczyca and B. M. McLaughlin, J. Phys. B. 33, L859 (2000)
Ne T. W. Gorczyca, Phys. Rev. A61, (2000)
C Hasoglu et al., ApJ 724, 1296 (2010)
Atomic and ionic photoabsorption calculations are crucial for elemental abundance determinations from X-ray spectra of cosmic
sources
O A. M. Juett et al., APJ 612, 308 (2004)
Ne A. M. Juett et al., APJ 648, 1066 (2006)
X-rays from about 0.12 to 12 keV (10 to 0.10 nm wavelength) are classified as "soft" X-rays, and from about 12 to 120 keV (0.01 to 0.10 nm wavelength) as "hard" X-rays, due to their penetrating abilities.
1/2/2019

14. ←Oxygen Ions
(Juett+ 2004)
←Neon Ions
(Juett+ 2006)

15. Cross Section Results for C-Ions at the K-Edge
Experimental Measurements exist ALS group
Beside 1s->2p and 3p resonances
For astrophysical use, important K-edge features are present.

16. Experimental Comparison: C2+ Photoexcitation**
**K-shell photoionization of Be-like C ions
S. W. J. Scully, A. Aguilar, E. D. Emmons, R. A. Phaneuf, M. Halka, D. Leitner, J. C. Levin, M. S. Lubell, R. Püttner, A. S. Schlachter, A. M. Covington, S. Schippers, A. Müller and B. M. McLaughlin
J. Phys. B. 38, 1967, 2005

17. Modeling the Observed X-Ray Spectra
K-shell Photoabsorption Studies of the Carbon Isonuclear Sequence
M. F. Hasoglu, S. A. Abdel-Naby, T. W. Gorczyca, J. J. Drake and B. M. McLaughlin
The Astrophysical Journal, 724, 1296, 2010

18. K-Shell Photoabsorption for Mg2+
a = const. and dominant as n → ∞
1/2/2019

19. Available Data for K-Shell Photoabsorption in Mg Ions

20. Spectator Auger
1/2/2019

21. Comparison with Previous Results: Mg2+ - Mg5+

22. Comparison with Previous Results: Mg+

23. Neutral Magnesium

24. http://tesla. physics. wmich
1/2/2019

26. 1/2/2019

27. 1/2/2019

28. Fe L-Shell Photoabsorption
1/2/2019

29. Thank You
1/2/2019