Theoretical simulations of emission spectra of Fe7+ and Fe8+
Zeng Jiao-Long (曾交龙)ab, Wang Yan-Gui (王雁桂)b, Zhao Gang (赵刚)a, Yuan Jian-Min (袁建民)ab
a National Astronomical Observatories,Chinese Academy of Sciences, Beijing 100012, China; b Department of Applied Physics, National University of Defense Technology, Changsha 410073, China
Abstract The energy levels, oscillator strengths, spontaneous radiative decay rates, and electron impact collision strengths are calculated for Fe VIII and Fe IX using the recently developed flexible atomic code (FAC). These atomic data are used to analyse the emission spectra of both laboratory and astrophysical plasmas. The nf--3d emission lines have been simulated for Fe VIII and Fe IX in a wavelength range of 6--14 nm. For Fe VIII, the predicted relative intensities of lines are insensitive to temperature. For Fe IX, however, the intensity ratios are very sensitive to temperature, implying that the information of temperature in the experiment can be inferred. Detailed line analyses have also been carried out in a wavelength range of 60--80 nm for Fe VIII, where the solar ultraviolet measurements of emitted radiation spectrometer records a large number of spectra. More lines can be identified with the aid of present atomic data. A complete dataset is available electronically from http://www.astrnomy.csdb.cn/EIE/.
Received: 13 June 2005
Revised: 03 April 2006
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10204024, 10373014, 10433010 and 10474138).
Cite this article:
Zeng Jiao-Long (曾交龙), Wang Yan-Gui (王雁桂), Zhao Gang (赵刚), Yuan Jian-Min (袁建民) Theoretical simulations of emission spectra of Fe7+ and Fe8+ 2006 Chinese Physics 15 1502
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