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Application of saturation absorption spectroscopy to study the hyperfine structure of 235U and accurate 235U/238U isotope ratio determinations at 861.031 nm
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2021-07-20 , DOI: 10.1039/d1ja00140j Wei Wei 1 , Igor Savukov 2 , Alonso Castro 1
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2021-07-20 , DOI: 10.1039/d1ja00140j Wei Wei 1 , Igor Savukov 2 , Alonso Castro 1
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The uranium transition 5f36d7s2 (5L6) → 5f37s27p (5K5) at 861.031 nm was studied using saturation absorption spectroscopy. The hyperfine structure of the 235U isotope was determined by measuring the Doppler-suppressed absorption spectrum, and the hyperfine structure constants were obtained by employing transition-specific line strength theory and spectral fitting. The magnetic-dipole and electric-quadrupole constants were determined to be A = −3.2887 ± 0.1957 mK and B = 31.8712 ± 8.0789 mK for the upper state 5f37s27p (5K5). A theoretical calculation for the hyperfine structure constants of the 235U isotope was also carried out by the relativistic configuration-interaction (RCI) method, and the obtained values were found to be in agreement with the measured values. In addition, the line profile of 238U was experimentally investigated for different excitation intensities and modeled using the RCI method for estimating the transition probability and oscillator strength, with various residual broadening mechanisms considered beyond the radiative decay. We show that these results allow us to make improvements on the precision of spectral measurements using our previously developed technique for isotope ratio determinations in atomic beams.
中文翻译：
应用饱和吸收光谱研究 235U 的超精细结构和在 861.031 nm 处准确测定 235U/238U 同位素比
使用饱和吸收光谱研究了 861.031 nm 处的铀跃迁 5f 3 6d7s 2 ( 5 L 6 ) → 5f 3 7s 2 7p ( 5 K 5 )。235 U同位素的超精细结构是通过测量多普勒抑制吸收光谱来确定的，超精细结构常数是通过采用跃迁特定线强度理论和光谱拟合获得的。磁偶极子和电四极子常数被确定为A = -3.2887 ± 0.1957 mK 和B = 31.8712 ± 8.0789 mK 对于上层状态 5f 3 7s 27p ( 5 K 5 )。235 U同位素的超精细结构常数也采用相对论构型相互作用（RCI）方法进行了理论计算，所得值与实测值一致。此外，对不同激发强度的238 U的线剖面进行了实验研究，并使用 RCI 方法进行建模，以估计跃迁概率和振荡器强度，并考虑了辐射衰减之外的各种残余展宽机制。我们表明，这些结果使我们能够使用我们先前开发的用于原子束中同位素比测定的技术来提高光谱测量的精度。
更新日期：2021-07-23
中文翻译：
应用饱和吸收光谱研究 235U 的超精细结构和在 861.031 nm 处准确测定 235U/238U 同位素比
使用饱和吸收光谱研究了 861.031 nm 处的铀跃迁 5f 3 6d7s 2 ( 5 L 6 ) → 5f 3 7s 2 7p ( 5 K 5 )。235 U同位素的超精细结构是通过测量多普勒抑制吸收光谱来确定的，超精细结构常数是通过采用跃迁特定线强度理论和光谱拟合获得的。磁偶极子和电四极子常数被确定为A = -3.2887 ± 0.1957 mK 和B = 31.8712 ± 8.0789 mK 对于上层状态 5f 3 7s 27p ( 5 K 5 )。235 U同位素的超精细结构常数也采用相对论构型相互作用（RCI）方法进行了理论计算，所得值与实测值一致。此外，对不同激发强度的238 U的线剖面进行了实验研究，并使用 RCI 方法进行建模，以估计跃迁概率和振荡器强度，并考虑了辐射衰减之外的各种残余展宽机制。我们表明，这些结果使我们能够使用我们先前开发的用于原子束中同位素比测定的技术来提高光谱测量的精度。
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