$B^3Π_1$态的超精细结构和TlF的$X\rightarrow B$跃迁光循环行为的预测
Hyperfine Structure of the $B^3Π_1$ State and Predictions of Optical Cycling Behavior in the $X\rightarrow B$ transition of TlF
摘要：
用热分子束和低温分子束的激光诱导荧光测量了TlF分子$X^1Σ^+ \rightarrow B^3Π_1$跃迁的转动谱和超精细谱。得到了$B$态的转动常数和超精细常数。T1核自旋的大磁超精细相互作用导致最低$B$态转动能级的显著混合。更新，更精确的测量的$B\rightarrow X$振动分支分数也提出。组合的振转分支分数允许预测在给定的TIF光学循环方案中可以散射的光子的数量。
英文摘要：
The rotational and hyperfine spectrum of the $X^1Σ^+ \rightarrow B^3Π_1$ transition in TlF molecules was measured using laser-induced fluorescence from both a thermal and a cryogenic molecular beam. Rotational and hyperfine constants for the $B$ state are obtained. The large magnetic hyperfine interaction of the Tl nuclear spin leads to significant mixing of the lowest $B$ state rotational levels. Updated, more precise measurements of the $B\rightarrow X$ vibrational branching fractions are also presented. The combined rovibrational branching fractions allow for the prediction of the number of photons that can be scattered in a given TlF optical cycling scheme.
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