Simplest molecules as candidates for precise optical clocks.
Simplest molecules as candidates for precise optical clocks.
复制标题
DOI：
10.1103/physrevlett.113.023004
复制
发表时间：
2014-07
影响因子：
8.6
通讯作者：
S. Schiller;D. Bakalov;V. Korobov
中科院分区：
文献类型：
--
作者：
S. Schiller;D. Bakalov;V. Korobov
精确测量冷的、被捕获的分子的跃迁频率在基础物理学中有应用，并且需要极高的精度。我们确定合适的候选人，考虑最简单的分子与一个单一的电子，其外场位移校正可以计算理论上具有高精度。我们的计算表明，H（2）（+）具有特殊的跃迁，其分数系统不确定度在室温下可降低到5×10 ~（-17）。我们还概括了复合频率的方法，引入定制的线性组合的个别过渡频率是免费的主要系统的变化，独立的外部扰动场的强度。通过应用该技术，与利用单个转变可实现的情况相比，降低了复合频率的不确定性，例如，HD（+）的范围为10（-18）。因此，这些分子对于未来的研究具有重要意义。
The precise measurement of transition frequencies in cold, trapped molecules has applications in fundamental physics, and extremely high accuracies are desirable. We determine suitable candidates by considering the simplest molecules with a single electron, for which the external-field shift corrections can be calculated theoretically with high precision. Our calculations show that H(2)(+) exhibits particular transitions whose fractional systematic uncertainties may be reduced to 5×10(-17) at room temperature. We also generalize the method of composite frequencies, introducing tailored linear combinations of individual transition frequencies that are free of the major systematic shifts, independent of the strength of the external perturbing fields. By applying this technique, the uncertainty of the composite frequency is reduced compared to what is achievable with a single transition, e.g., to the 10(-18) range for HD(+). Thus, these molecules are of metrological relevance for future studies.