Fe VII发射线在193-197 nm波长范围内
Fe VII emission lines in the wavelength range 193-197 Å
摘要：
根据实验室光谱的新测量和原子数据计算，讨论了193-197 nm波长范围内Fe VII发射线的鉴别。这一区域对于研究Hinode航天器上的极紫外成像光谱仪的太阳光谱具有重要意义，极紫外成像光谱仪在这些波长处具有最高灵敏度。测量了十条谱线，它们来自$3p^53d^3$构型中的七个精细结构能级。两条线以前没有报道，并导致新的实验能量的$(a^2D)^3F_{2,3}$水平。更新的实验能量获得其余的水平。用新的原子模型计算了两个密度诊断比$λ$ 196.21/ $λ$ 195.39和$λ$ 196.21/ $λ$ 196.06的理论值，并由冕环足点的EIS谱导出了密度。
英文摘要：
The identifications of Fe VII emission lines in the wavelength range 193-197 Å are discussed in the light of new measurements of laboratory spectra and atomic data calculations. This region is of importance to studies of solar spectra from the EUV Imaging Spectrometer (EIS) on board the Hinode spacecraft, which has its peak sensitivity at these wavelengths. Ten lines are measured, arising from seven fine structure levels in the $3p^53d^3$ configuration. Two lines have not previously been reported and lead to new experimental energies for the $(a^2D)^3F_{2,3}$ levels. Updated experimental energies are obtained for the remaining levels. The new atomic model is used to compute theoretical values for the two density diagnostic ratios $λ$196.21/$λ$195.39 and $λ$196.21/$λ$196.06, and densities are derived from EIS spectra of coronal loop footpoints.
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