The 3C/3D Line Ratio in Ni XIX: New AbInitio Theory and Experimental Results

Details The 3C/3D Line Ratio in Ni XIX: New AbInitio Theory and Experimental Results The 3C/3D Line Ratio in Ni XIX: New AbInitio Theory and Experimental Results

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvl..97n3201c&link_type=abstract

Physical Review Letters, vol. 97, Issue 14, id. 143201

Astronomy and Astrophysics

Astrophysics

15

Electron-Ion Scattering, Excitation And Ionization, X-Ray And Gamma-Ray Measurements, Laboratory Studies Of Space- And Astrophysical-Plasma Processes, Atomic And Molecular Data, Spectra, And Spectral Parameters

Scientific paper

We report a fully relativistic close-coupling calculation of the electron impact excitation of Ni xix to derive the 3C/3D line intensity ratio, with an uncertainty of 5%. Convergence of the calculation with respect to both channel coupling effects and the many interacting Rydberg series of resonances has been achieved. New measurements in an electron beam ion trap agree with our calculation. We show that the 3C/3D x-ray line ratio depends sensitively on both electron energy and beamwidth in an optically thin plasma. Accounting for this dependence improves the accuracy of the Ni abundance determination in astrophysical sources.

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