A Homonuclear Molecule with a Permanent Electric Dipole Moment
A Homonuclear Molecule with a Permanent Electric Dipole Moment
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DOI：
10.1126/science.1211255
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发表时间：
2011-11-25
期刊：
影响因子：
56.9
通讯作者：
Pfau, T.
中科院分区：
文献类型：
--
作者：
Li, W.;Pohl, T.;Pfau, T.
分子中的永久电偶极矩需要打破宇称对称性。传统上，这种对称性破缺依赖于异核成分的存在。我们报告了在同核分子中观察到的永久电偶极矩，其中结合是基于原子之间的不对称电子激发。这些奇特分子由一个基态铷 (Rb) 原子组成，该原子结合在第二个 Rb 原子内，第二个 Rb 原子被电子激发到高位里德伯态。详细计算预测偶极矩约为 1 德拜，与观测结果非常一致。
Permanent electric dipole moments in molecules require a breaking of parity symmetry. Conventionally, this symmetry breaking relies on the presence of heteronuclear constituents. We report the observation of a permanent electric dipole moment in a homonuclear molecule in which the binding is based on asymmetric electronic excitation between the atoms. These exotic molecules consist of a ground-state rubidium (Rb) atom bound inside a second Rb atom electronically excited to a high-lying Rydberg state. Detailed calculations predict appreciable dipole moments on the order of 1 Debye, in excellent agreement with the observations.