An unexpectedly low oscillator strength as the origin of the Fexvii emission problem

Nature

Volumn 492, Issue 7428, 2012, Pages 225-228

  Bernitt, S ^a   Brown, G V ^b   Rudolph, J K ^a,c   Steinbrugge R ^a   Graf, A ^b   Leutenegger, M ^d,e   Epp, S W ^a,f   Eberle, S ^a   Kubicek K ^a,n   MacKel V ^a,o   Simon, M C ^g   Trabert E ^b   Magee, E W ^b   Beilmann, C ^a   Hell, N ^b,h   Schippers, S ^c   Muller A ^c   Kahn, S M ⁱ   Surzhykov, A ^j,k   Harman, Z ^a,l   Keitel, C H ^a   Clementson, J ^b   Porter, F S ^d   Schlotter, W ^m   Turner, J J ^m   Ullrich, J ^a,p   Beiersdorfer, P ^b   López Urrutia, J R Crespo ^a   more..

^a MAX PLANCK INSTITUT FÜR KERNPHYSIK   (Germany)

^b LAWRENCE LIVERMORE NATIONAL LABORATORY   (United States)

^c JUSTUS LIEBIG UNIVERSITY   (Germany)

^d NASA GODDARD SPACE FLIGHT CENTER   (United States)

^e UNIVERSITY OF MARYLAND   (United States)

^f Center for Free Electron Laser Science   (Germany)

^g TRIUMF   (Canada)

^h UNIVERSITY OF ERLANGEN NUREMBERG   (Germany)

ⁱ STANFORD UNIVERSITY   (United States)

^j UNIVERSITY OF HEIDELBERG   (Germany)

^k GSI HELMHOLTZZENTRUM FÜR SCHWERIONENFORSCHUNG GMBH   (Germany)

^l ExtreMe Matter Institut   (Germany)

^m SLAC NATIONAL ACCELERATOR LABORATORY   (United States)

ⁿ MAX PLANCK INSTITUTE FOR BIOPHYSICAL CHEMISTRY   (Germany)

^o RIKEN   (Japan)

^p PHYSIKALISCH TECHNISCHE BUNDESANSTALT   (Germany)

more..

Author keywords

[No Author keywords available]

Indexed keywords

IRON;

ASTROPHYSICS; OSCILLATION; PLASMA; SOLAR ACTIVITY; WAVELENGTH; X-RAY;

ARTICLE; CALCULATION; FLUORESCENCE SPECTROSCOPY; LASER; MEASUREMENT; MODEL; OSCILLATOR; PRIORITY JOURNAL; QUANTUM MECHANICS; SUN; X RAY; X RAY FLUORESCENCE;

EID: 84870977484     PISSN: 00280836     EISSN: 14764687     Source Type: Journal    
DOI: 10.1038/nature11627     Document Type: Article

References (30)

1. Paerels, F. B. S.&Kahn, S. M. High-resolution X-ray spectroscopy withChandraand XMM-Newton. Annu. Rev. Astron. Astrophys. 41, 291-342 (2003).
2. Behar, E., Cottam, J. & Kahn, S. M. The Chandra iron-L X-ray line spectrum of Capella. Astrophys. J. 548, 966-975 (2001).
3. Xu, H. et al. High-resolution observations of the elliptical galaxyNGC 4636 with the reflection grating spectrometer on board XMM-Newton. Astrophys. J. 579, 600-606 (2002).
4. Emma, P. et al. First lasing and operation of an a?ngstrom-wavelength free-electron laser. Nature Photon. 4, 641-647 (2010).
5. Beiersdorfer, P. et al. Measurement of the 3dR2p resonance to intercombination line-intensity ratio in neonlike FeXVII,GeXXIII, andSe XXV. Phys. Rev.A64, 032705 (2001).
6. Beiersdorfer, P. et al. Laboratory measurements of the Fe XVII 2p-3s and 2p-3d transitionsand comparisonwith solarand astrophysicalobservations. Astrophys. J. 610, 616-623 (2004).
7. Parkinson, J. H. New observations of Fe XVII in the solar X-ray spectrum. Astron. Astrophys. 24, 215-218 (1973).
8. Schmelz, J. T., Saba, J. L. R. & Strong, K. T. Resonance scattering of Fe XVII-a density diagnostic. Astrophys. J. 398, L115-L118 (1992).
9. Waljeski, K. et al. The composition of a coronal active region. Astrophys. J. 429, 909-923 (1994).
10. Brown, G. V. et al. Diagnostic utility of the relative intensity of 3C to 3D in Fe XVII. Astrophys. J. 557, L75-L78 (2001).
11. Brown, G. V. et al. Energy-dependent excitation cross sectionmeasurements of the diagnostic lines of Fe XVII. Phys. Rev. Lett. 96, 253201 (2006).
12. Chen, G.-X. Converged Dirac R-matrix calculation of electron impact excitation of Fe XVII. Phys. Rev. A 76, 062708 (2007).
13. Nikulin, V. K. & Trzhaskovskaya, M. B. Comment on "Energy-dependent excitation cross sectionmeasurements of the diagnostic lines of FeXVII". Phys.Rev. Lett. 108, 139301 (2012).
14. Brown, G. V. & Beiersdorfer, P. Brown and Beiersdorfer reply. Phys. Rev. Lett. 108, 139302 (2012).
15. Fournier, K. B.&Hansen,S. B.Resolutionof the long-standing overprediction of the resonance to intercombination line-intensity ratio in mid-Z neonlike ions. Phys. Rev. A 71, 012717 (2005).
16. Gu, M. F. New benchmark of X-ray line emission models of Fe XVII. Preprint at http://arXiv.org/abs/0905.0519v1 (2009).
17. Epp, S. W. et al. Soft X-ray laser spectroscopy on trapped highly charged ions at FLASH. Phys. Rev. Lett. 98, 183001 (2007).
18. Marrs, R. E., Beiersdorfer, P. & Schneider, D. The Electron Beam Ion Trap. Phys. Today 47, 27-34 (1994).
19. Epp, S. W. et al. X-ray laser spectroscopy of highly charged ions at FLASH. J. Phys. At. Mol. Opt. Phys. 43, 194008 (2010).
20. Schlotter, W. F. et al. The soft X-ray instrument for materials studies at the linac coherent light source X-ray free-electron laser. Rev. Sci. Instrum. 83, 043107 (2012).
21. Bhatia, A. K. Atomic data and spectral line intensities for the neon isoelectronic sequence (Si V through Kr XXVII). At. Data Nucl. Data Tables 32, 435-469 (1985).
22. Bhatia, A. K.&Doschek, G. A. Atomic data and spectral line intensities for Ne-like Fe XVII. At. Data Nucl. Data Tables 52, 1-23 (1992).
23. Cornille, M., Dubau, J. & Jacquemot, S. Radiative and collisional atomic data for neon-like ions. At. Data Nucl. Data Tables 58, 1-66 (1994).
24. Safronova, U. I. et al. Electric-dipole, electric-quadrupole, magnetic-dipole, and magnetic-quadrupole transitions in the neon isoelectronic sequence. Phys. Rev. A 64, 012507 (2001).
25. Huenemoerder, D. P. et al. TGCat: The Chandra transmission grating data catalog and archive. Astron. J. 141, 129 (2011).
26. Brown, G. V. et al. Laboratory measurement and modeling of the Fe XVII X-ray spectrum. Astrophys. J. 502, 1015-1026 (1998).
27. Blake, R. L. et al. Spectral and photometric measurements of solar X-ray emission below 60A? . Astrophys. J. 142, 1-12 (1965).
28. McKenzie, D. L. et al. Solar flare X-ray spectra between 7.8 and 23.0A? ngstroms. Astrophys. J. 241, 409-416 (1980).
29. Mewe, R. et al. CHANDRA-LETGS X-ray observations of Capella. Astron. Astrophys. 368, 888-900 (2001).
30. Ralchenko, Y. et al. NIST Atomic Spectra Database (ver. 4.1.0) http://physics.nist.gov/asd (National Institute of Standards and Technology; accessed,27March 2012).