Excitation Cross Section Measurement for n = 3 to n = 2 Line Emission in Fe20+ to Fe23+
Excitation Cross Section Measurement for n = 3 to n = 2 Line Emission in Fe20+ to Fe23+
复制标题
Fe20 至 Fe23 中 n = 3 至 n = 2 线发射的激发截面测量
DOI：
10.1086/426135
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
S. Kahn
中科院分区：
文献类型：
--
作者：
H. Chen;P. Beiersdorfer;J. Scofield;G. V. Brown;K. Boyce;R. Kelley;C. Kilbourne;F. Porter;M. Gu;S. Kahn
利用晶体谱仪和6 × 6元素阵列微量热计，在EBIT-II型电子束离子阱中测量了Fe XXI ~ Fe XXIV的l -壳层3→2线的电子冲击激发截面。通过对已建立的辐射电子捕获截面的直接归一化确定了截面，并总结了计算出的Fe16+至Fe23+离子的n = 2态精细结构能级的电子捕获的能量依赖辐射复合截面。给出了17条线的测量结果，并与模型计算结果进行了比较。虽然模型计算与实验的一致性对大多数测量线来说是好的，但在一些线中发现了显著的差异，包括Fe XXI中最强的线。
Electron impact excitation cross sections have been measured for iron L-shell 3 → 2 lines of Fe XXI to Fe XXIV at the EBIT-II electron beam ion trap using a crystal spectrometer and a 6 × 6 element array microcalorimeter. The cross sections were determined by direct normalization to the well-established cross section of radiative electron capture, and a summary of calculated energy-dependent radiative recombination cross sections for electron capture into the n = 2 state fine-structure levels of Fe16+ to Fe23+ ions is given. The measurement results for 17 lines and their comparison with model calculations are presented. While agreement of the model calculations with the experiment is good for most measured lines, significant discrepancies were found for a few lines, including the strongest line in Fe XXI.