Characterizing the fundamental bending vibration of a linear polyatomic molecule for symmetry violation searches
Characterizing the fundamental bending vibration of a linear polyatomic molecule for symmetry violation searches
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DOI：
10.1088/1367-2630/ace471
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发表时间：
2023-01
影响因子：
3.3
通讯作者：
A. Jadbabaie;Y. Takahashi;N. Pilgram;Chandler J Conn;Yi Zeng;Chi Zhang;N. Hutzler
中科院分区：
文献类型：
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作者：
A. Jadbabaie;Y. Takahashi;N. Pilgram;Chandler J Conn;Yi Zeng;Chi Zhang;N. Hutzler
多原子分子是研究标准模型之外的电荷宇称破坏和宇称破坏物理的敏感探针。例如，许多线性三原子分子都是激光冷却的，并且在弯曲振动产生的基态电子X 2+（010）态中具有宇称二重态，这两个特征都可以极大地帮助BSM搜索。了解X ~ 2Σ+（010）状态是精确测量线性多原子分子的重要先决条件。在这里，我们使用高分辨率光学光谱在588 nm处的名义上禁止的X <$2 <$+（010）→A <$2 <$1/2（000）跃迁上表征了174 YbOH的基本弯曲振动。我们分配了39个跃迁，这些跃迁起源于X 2+（010）态的最低转动能级，并使用最佳拟合参数用有效哈密顿量精确地模拟了态的结构。此外，我们对X射线2 π +（010）态进行了斯塔克和塞曼光谱，并将分子框架偶极矩拟合为Dmol=2.16（1）D，有效电子g因子拟合为gS=2.07（2）。此外，我们使用一个经验模型来解释观察到的异常线强度的自旋轨道和振动扰动的干扰在激发态A <$2 <$1/2（000）。我们的工作是在YbOH和其他线性多原子分子中搜索BSM物理的重要一步。
Polyatomic molecules have been identified as sensitive probes of charge-parity violating and parity violating physics beyond the Standard Model (BSM). For example, many linear triatomic molecules are both laser-coolable and have parity doublets in the ground electronic X˜2Σ+(010) state arising from the bending vibration, both features that can greatly aid BSM searches. Understanding the X˜2Σ+(010) state is a crucial prerequisite to precision measurements with linear polyatomic molecules. Here, we characterize the fundamental bending vibration of 174 YbOH using high-resolution optical spectroscopy on the nominally forbidden X˜2Σ+(010) →A˜2Π1/2(000) transition at 588 nm. We assign 39 transitions originating from the lowest rotational levels of the X˜2Σ+(010) state, and accurately model the state’s structure with an effective Hamiltonian using best-fit parameters. Additionally, we perform Stark and Zeeman spectroscopy on the X˜2Σ+(010) state and fit the molecule-frame dipole moment to Dmol=2.16(1) D and the effective electron g-factor to gS=2.07(2) . Further, we use an empirical model to explain observed anomalous line intensities in terms of interference from spin–orbit and vibronic perturbations in the excited A˜2Π1/2(000) state. Our work is an essential step toward searches for BSM physics in YbOH and other linear polyatomic molecules.