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arXiv 1107.2287physics.atom-ph
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ThO中$H\ {}^3Δ_1$态的磁矩和电偶极矩

Magnetic and electric dipole moments of the $H\ {}^3Δ_1$ state in ThO

Amar C. Vutha, Benjamin Spaun, Yulia V. Gurevich, Nicholas R. Hutzler, Emil Kirilov, John M. Doyle, Gerald Gabrielse, David DeMille

摘要:

一氧化钍(ThO)分子中的亚稳态$H \ {}^3Δ_1$对CP破坏的电子永久电偶极矩(eEDM)的存在高度敏感。测量该状态的磁偶极矩$μ_H$和分子固定电偶极矩$D_H$,为寻找eEDM做准备。小磁矩$μ_H = 8.5(5) \times 10^{-3} \ μ_B$显示了预测的${}^3 Δ_1$顺磁分子状态中自旋和轨道贡献的抵消,为抑制eEDM搜索中的磁场噪声和相关系统效应提供了显著优势。此外,诱导的电偶极矩示出为完全饱和,在非常温和的电场($<$ 10 V/cm)。这一特性有利于抑制ThO eEDM搜索实验中许多其它潜在的系统误差。

英文摘要:

The metastable $H \ {}^3Δ_1$ state in the thorium monoxide (ThO) molecule is highly sensitive to the presence of a CP-violating permanent electric dipole moment of the electron (eEDM). The magnetic dipole moment $μ_H$ and the molecule-fixed electric dipole moment $D_H$ of this state are measured in preparation for a search for the eEDM. The small magnetic moment $μ_H = 8.5(5) \times 10^{-3} \ μ_B$ displays the predicted cancellation of spin and orbital contributions in a ${}^3 Δ_1$ paramagnetic molecular state, providing a significant advantage for the suppression of magnetic field noise and related systematic effects in the eEDM search. In addition, the induced electric dipole moment is shown to be fully saturated in very modest electric fields ($<$ 10 V/cm). This feature is favorable for the suppression of many other potential systematic errors in the ThO eEDM search experiment.

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