Converged Dirac R-matrix calculation of electron impact excitation of Fe XVII
- ITAMP, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)
Large discrepancies exist between measurements [Brown et al., Phys. Rev. Lett. 96, 253201 (2006)] and previous calculations [Chen and Pradhan, Phys. Rev. Lett. 89, 013202 (2002)] for electron impact excitation (EIE) cross sections in 3C ({lambda} 15.015 A) and 3D ({lambda} 15.262 A) of Fe XVII. A converged Dirac R-matrix calculation of EIE in Fe XVII with an accuracy of {approx_equal}5% (from theory estimate) in 3C and 3D cross sections is reported. We carry out five sets of Dirac R-matrix calculations to establish the convergence in our calculations. Full relativistic effects are included and the convergence of both the correlation and channel coupling effects and the combined effects of interacting Rydberg resonance series in EIE of Fe XVII is achieved. The intrinsic oscillatory features of 3C and 3D effective cross sections convolved with electron distributions are further demonstrated. Compared with recent electron beam ion trap (EBIT) measurements, there is still an {approx_equal}20% difference. I give one possible reason for this puzzling difference.
- OSTI ID:
- 21140659
- Journal Information:
- Physical Review. A, Vol. 76, Issue 6; Other Information: DOI: 10.1103/PhysRevA.76.062708; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
Similar Records
Relativistic close-coupling calculation of photoionization and photorecombination of Fe XVI
Comment on 'Dirac R-matrix method for the calculation of x-ray line polarization'