论文标题
增强$^{81} \ Mathrm {kr} $和$^{85} \ Mathrm {Kr} $计数费率通过光学泵送
Enhancement of the $^{81}\mathrm{Kr}$ and $^{85}\mathrm{Kr}$ count rates by optical pumping
论文作者
论文摘要
我们报告说，在原子陷阱跟踪分析方法中，通过增强放电源中亚稳态的原子的产生来增强原子陷阱跟踪分析方法中的稀有$^{81} \ MathRM {KR} $和$^{85} $ 60％的数量增加60％。亚稳态中的其他原子$ 1S_5 $级别（Paschen符号）是通过光学地泵送$ 1S_4-2P_6 $过渡以819 nm的方式获得的。通过求解系统的主方程式，我们确定该过渡是最合适的转变，并可以描述亚稳态人群的测得的增加，这是819 nm激光功率的函数。我们计算$^{81} \ Mathrm {Kr} $和$^{85} \ Mathrm {Krrm {kr} $的$ 1S_4-2P_6 $转换的先前未知的同位素偏移和超细分组。 $^{81} \ Mathrm {kr} $和$^{85} \ Mathrm {KR} $日期的所需样本量的相应减少可以使所需的样本量的相应减少，这是对海水和深层冰核的大量改进。
We report an increase of up to 60% on the count rates of the rare $^{81}\mathrm{Kr}$ and $^{85}\mathrm{Kr}$ isotopes in the Atom Trap Trace Analysis method by enhancing the production of metastable atoms in the discharge source. Additional atoms in the metastable $ 1s_5 $ level (Paschen notation) are obtained via optically pumping the $1s_4-2p_6$ transition at 819 nm. By solving the master equation for the system, we identify this transition to be the most suitable one and can describe the measured increase in metastable population as a function of the 819-nm laser power. We calculate the previously unknown isotope shifts and hyperfine splittings of the $1s_4-2p_6$ transition in $^{81}\mathrm{Kr}$ and $^{85}\mathrm{Kr}$, and verify the results with count rate measurements. The demonstrated count-rate increase enables a corresponding decrease in the required sample sizes for $^{81}\mathrm{Kr}$ and $^{85}\mathrm{Kr}$ dating, a significant improvement for applications such as dating of ocean water and deep ice cores.
