The Emission Lines and Abundance Evolution of Fe XVIII-XXIII Measured at the Electron Beam Iron Trap
The Extreme-ultraviolet spectra of highly charged iron ions in the wavelength range of 90-160 (A) have been measured at the Heidelberg electron beam ion trap (EBIT).Emission spectra were recorded sequentially by varying the electron beam energy over the range of 1290-2290 eV.The emission lines from Fe ⅩⅧ-ⅩⅩⅢ are identified using the SASAL model.The Atomic data for modelling the spectra of these ions are calculated using the Flexible Atomic Data Code (FAC).The ionic fraction of each ion are determined from the measured EUV spectroscopy.We found the different features of the ionic fraction distributions between the thermal plasma and the EBIT plasma.The ionic fraction distributions from the EBIT plasma are also calculated using the SASAL model.The trends between the measured ionic fraction and the theoretical values can agree well, although the absolute value have large differences.The polarization effects due to the nonthermal (monoenergetic) electrons for strong emission lines are also theoretically considered using the FAC code.The contributions from the polarization effects on the line intensities have been found to be negligible (less than 10%) for emission lines of Fe ⅩⅧ-ⅩⅩⅢ in the wavelength range of 90-160(A).
EUV spectroscopy Electron Beam Ion Trap Emission lines HCI Ionization balance
F.Li G.Y.Liang J.R.Crespo L(o)pez-Urrutia T.M.Baumann G.Zhao
National Astronomical Observatories, CAS, A20 Datun Road, Chaoyang District, Beijing 100012, China Max-Planck-Institut f(u)r Kernphysik, Saupfercheckweg 1, 69117 Heidelberg,Germany
国际会议
昆明
英文
155-162
2014-05-01（万方平台首次上网日期，不代表论文的发表时间）