Fe II lifetimes and transition probabilities
Fe II lifetimes and transition probabilities
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Fe II 寿命和跃迁概率
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
M. Kock
中科院分区：
文献类型：
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作者：
R. Schnabel;M. Schultz;M. Kock
采用时间分辨非线性激光诱导荧光技术测量了Fe Ⅱ的辐射寿命。我们研究了21个高达47000 cm-1的水平。不确定性通常为2 - 3%。寿命提供了一个改进的绝对规模，我们的分支分数，这是用傅里叶变换光谱仪和高分辨率光栅光谱仪测量，并已发表较早。我们报告的绝对跃迁概率的140 Fe II线在波长范围220-780 nm。强跃迁的总体不确定性估计为6%，弱跃迁的总体不确定性估计为26%。结果与最近的实验数据从文献中进行了比较。我们的大量精确数据可用于对天体物理等离子体中铁丰度计算的理论数据进行可靠性检查。
Fe II radiative lifetimes were measured applying the time-resolved nonlinear laser-induced fluoresence technique. We investigated 21 levels of up to 47 000 cm −1 . The uncertainties are typically 2−3%. The lifetimes provide an improved absolute scale to our branching fractions which were measured with a Fourier transform spectrometer and a high-resolution grating spectrometer and which have been published earlier. We report absolute transition probabilities of 140 Fe II lines in the wavelength range 220-780 nm. The overall uncertainties are estimated to be 6% for the strong and up to 26% for the weak transitions. The results are compared with recent experimental data from the literature. Our large set of accurate data can be used for a reliability check of theoretical data calculated for iron abundances in astrophysical plasmas.