Enhanced molecular yield from a cryogenic buffer gas beam source via excited state chemistry
Enhanced molecular yield from a cryogenic buffer gas beam source via excited state chemistry
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DOI：
10.1088/1367-2630/ab6eae
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发表时间：
2020-02-01
影响因子：
3.3
通讯作者：
Hutzler, Nicholas R.
中科院分区：
文献类型：
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作者：
Jadbabaie, Arian;Pilgram, Nickolas H.;Hutzler, Nicholas R.
我们使用 Yb 原子的窄带激光激发来大幅增强 YbOH 冷光束的亮度，YbOH 是一种多原子分子，对物理学具有超出标准模型 (BSM) 的高灵敏度。通过在低温环境中将原子 Yb 激发至亚稳态 P-3(1) 态，我们显着增加了 Yb 与反应物碰撞的化学反应截面。我们描述了增强对激光特性的依赖性，并研究了 YbOH 产物的最终状态分布。由此产生的明亮、冷的 YbOH 光束可用于提高利用 YbOH 寻找新物理的统计灵敏度，例如电子电偶极矩和核磁四极矩实验。我们还进行了新的量子化学计算，证实了在我们的实验中观察到的增强的反应性，并比较了 Yb(P-3) 与反应物 H2O 和 H2O2 的反应路径。更一般地说，我们的工作提出了一种广泛的方法来改进使用低温分子束进行激光冷却和 BSM 物理精确测量搜索的实验。
We use narrow-band laser excitation of Yb atoms to substantially enhance the brightness of a cold beam of YbOH, a polyatomic molecule with high sensitivity to physics beyond the standard model (BSM). By exciting atomic Yb to the metastable P-3(1) state in a cryogenic environment, we significantly increase the chemical reaction cross-section for collisions of Yb with reactants. We characterize the dependence of the enhancement on the properties of the laser light, and study the final state distribution of the YbOH products. The resulting bright, cold YbOH beam can be used to increase the statistical sensitivity in searches for new physics utilizing YbOH, such as electron electric dipole moment and nuclear magnetic quadrupole moment experiments. We also perform new quantum chemical calculations that confirm the enhanced reactivity observed in our experiment and compare reaction pathways of Yb(P-3) with the reactants H2O and H2O2. More generally, our work presents a broad approach for improving experiments that use cryogenic molecular beams for laser cooling and precision measurement searches of BSM physics.