Visible and ultraviolet laser spectroscopy of ThF

Visible and ultraviolet laser spectroscopy of ThF
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ThF 的可见光和紫外激光光谱

DOI:
10.1016/j.jms.2019.02.006
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发表时间:
2019
影响因子:
1.4
通讯作者:
Cornell, Eric A.
Cornell, Eric A.
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Zhou, Yan;Ng, Kia Boon;Cheng, Lan;Gresh, Daniel N.;Field, Robert W.;Ye, Jun;Cornell, Eric A.

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分子离子ThF+是JILA下一代电子电偶极矩(eEDM)搜索中使用的物质。测量需要在eEDM敏感状态下产生分子离子,旋转振动基态3 Δ 1,v+= 0,J+= 1。需要中性ThF的测量光谱来识别用于共振增强多光子电离(REMPI)方案的适当中间状态,该方案将在所需状态下产生离子。我们使用激光诱导荧光(LIF)和1+ 1′ REMPI光谱对ThF进行宽带测量光谱(从13,000到44,000 cm− 1)。我们观察和分配345个以前未报道的振动频带的ThF。我们证明,使用Ω= 3/2 [32.85]中间态,在eEDM敏感态下产生ThF+离子的效率为30%。此外,我们提出了一种方法,通过使用振动自电离通过核心非穿透里德伯态,提高上述效率到100%,并讨论了理论和实验挑战。最后,我们还报告了83个振动带的杂质物种,钍。
The molecular ion ThF+ is the species to be used in the next generation of search for the electron’s Electric Dipole Moment (eEDM) at JILA. The measurement requires creating molecular ions in the eEDM sensitive state, the rovibronic ground state 3 Δ 1, v+= 0, J+= 1. Survey spectroscopy of neutral ThF is required to identify an appropriate intermediate state for a Resonance Enhanced Multi-Photon Ionization (REMPI) scheme that will create ions in the required state. We perform broadband survey spectroscopy (from 13,000 to 44,000 cm− 1) of ThF using both Laser Induced Fluorescence (LIF) and 1+ 1′ REMPI spectroscopy. We observe and assign 345 previously unreported vibronic bands of ThF. We demonstrate 30% efficiency in the production of ThF+ ions in the eEDM sensitive state using the Ω= 3/2 [32.85] intermediate state. In addition, we propose a method to increase the aforementioned efficiency to∼ 100% by using vibrational autoionization via core-nonpenetrating Rydberg states, and discuss theoretical and experimental challenges. Finally, we also report 83 vibronic bands of an impurity species, ThO.
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