Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phrva..76f2708c&link_type=abstract
Physical Review A, vol. 76, Issue 6, id. 062708
Physics
13
Electron-Ion Scattering, Excitation And Ionization, X-Ray And Gamma-Ray Measurements, Atomic And Molecular Data, Spectra, And Spectral Parameters
Scientific paper
Large discrepancies exist between measurements [Brown , 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 (λ15.015Å) and 3D (λ15.262Å) of Fe XVII. A converged Dirac R -matrix calculation of EIE in Fe XVII with an accuracy of ≈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 ≈20% difference. I give one possible reason for this puzzling difference.
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