Kawall D, Bay F, Bickman S, Jiang Y, DeMille D
Department of Physics, Yale University, P.O. Box 208120, New Haven, Connecticut 06520-8120, USA.
Phys Rev Lett. 2004 Apr 2;92(13):133007. doi: 10.1103/PhysRevLett.92.133007.
The metastable a(1)[(3)Sigma(+)] state of PbO has been suggested as a suitable system in which to search for the electric dipole moment of the electron. We report here the development of experimental techniques allowing high-sensitivity measurements of Zeeman and Stark effects in this system, similar to those required for such a search. We observe Zeeman quantum beats in fluorescence from a vapor cell of PbO, with shot-noise limited extraction of the quantum beat frequencies, high counting rates, and long coherence times. We argue that improvement in sensitivity to the electron electric dipole moment by at least 2 orders of magnitude appears possible using these techniques.
氧化铅的亚稳态a(1)[(3)西格玛(+)]态被认为是寻找电子电偶极矩的合适系统。我们在此报告实验技术的进展，该技术能对该系统中的塞曼效应和斯塔克效应进行高灵敏度测量，这与此类探索所需的测量相似。我们在氧化铅蒸气室的荧光中观测到了塞曼量子拍，量子拍频率的提取受散粒噪声限制，计数率高且相干时间长。我们认为，使用这些技术有可能将对电子电偶极矩的灵敏度至少提高两个数量级。
