Atomic data for astrophysics: Fe xi soft X-ray lines

作者：Del Zanna G^*; Storey P J

来源：Astronomy & Astrophysics, 2013, 549: A42.

DOI：10.1051/0004-6361/201219835

• atomic data
• Sun: corona
• line: identification
• techniques: spectroscopic

We present new large-scale R-matrix (up to n = 4) and distorted wave (up to n = 6) scattering calculations for electron collisional excitation of Fe XI. These data are needed for the analysis of soft X-ray spectra of astrophysical plasmas, where strong n = 4 -> n = 3 transitions are present. As found in previous work on Fe X, Fe XIII, and Fe XIII, resonances from within the n = 4 levels and cascading from higher levels significantly increase the intensities of these lines. We provide a list of the strongest lines, many of which are unidentified. The present larger model produces intensities for decays from n = 3 levels mostly consistent with our previous work, however significant enhancements for some lower levels are found, in particular for the 3s(2) 3p(3) 3d D-5 which can be used to measure electron temperatures in the solar corona with the Hinode/EIS spectrometer.

• 出版日期2013-1