Oscillator strengths for high-excitation Ti II from laboratory measurements and calculations
Oscillator strengths for high-excitation Ti II from laboratory measurements and calculations
复制标题
实验室测量和计算得出的高激励 Ti II 振荡器强度
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
K. Blagoev
中科院分区：
文献类型：
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作者：
H. Lundberg;H. Hartman;L. Engström;H. Nilsson;A. Persson;P. Palmeri;P. Quinet;V. Fivet;G. Malcheva;K. Blagoev
本文报道了单离化钛中6个3D2(3F)5s能级和4个3D2(3F)4P奇宇称能级的新的实验辐射寿命，其中我们证实了以前的研究。将新的5S寿命与Pickering等人之前测量的分支分数相结合，我们报告了从5s水平跃迁的57个实验对数GF值。寿命测量是利用激光烧蚀产生的离子的时间分辨激光诱导荧光进行的。采用一步和两步光子激发分别达到4p能级和5s能级。报道了测量能级的辐射寿命以及由这些能级产生的3336跃迁的振子强度的理论计算。计算采用了考虑核偏振效应的伪相对论Hartree-Fock方法。理论结果与实验结果吻合较好，是精确测定天体丰度所必需的。(更少)
This work reports new experimental radiative lifetimes of six 3d2(3F)5s levels in singly ionized titanium, with an energy around 63 000 cm-1 and four 3d2(3F)4p odd parity levels where we confirm previous investigations. Combining the new 5s lifetimes with branching fractions measured previously by Pickering et al., we report 57 experimental log gf values for transitions from the 5s levels. The lifetime measurements are performed using time-resolved laser-induced fluorescence on ions produced by laser ablation. One- and two-step photon excitation is employed to reach the 4p and 5s levels, respectively. Theoretical calculations of the radiative lifetimes of the measured levels as well as of oscillator strengths for 3336 transitions from these levels are reported. The calculations are carried out by a pseudorelativistic Hartree-Fock method taking into account core-polarization effects. The theoretical results are in a good agreement with the experiments and are needed for accurate abundance determinations in astronomical objects. (Less)