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[6.01] Laboratory Measurements of 3\to 2 X-ray Emission Lines of Ne-like Ni XIX

M. F. Gu (Department of Physics, Stanford University), P. Beiersdorfer (Lawrence Livermore National Laboratory), G. V. Brown (Department of Astronomy, University of Maryland), H. Chen (Lawrence Livermore National Laboratory), K. R. Boyce, R. L. Kelley, C. A. Kilbourne, F. S. Porter (NASA Goddard Space Flight Center), S. M. Kahn (Department of Physics, Stanford University)

The intensity ratios between 3\to 2 emission lines in Ni XIX were measured on the Livermore electron beam ion trap (EBIT-I) with a flat-field grating spectrometer and the NASA/GSFC X-ray microcalorimeter. The results are consistent with earlier measurements of Fe XVII and other Ne-like ions at Livermore, and confirm the problems in the atomic modeling of the direct collisional excitation for Ne-like systems. Specificly, we found that the measured 3D/3C line ratio is larger than various theoretical predictions by 15-20%, and the measured 3F+3G+M2/3C ratio is about 20% larger than predicted.

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Bulletin of the American Astronomical Society, 36 #3
© 2004. The American Astronomical Soceity.