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首页> 外文期刊>The European physical journal, D. Atomic, molecular, and optical physics >Concepts for direct frequency-comb spectroscopy of Th-229m and an internal-conversion-based solid-state nuclear clock
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Concepts for direct frequency-comb spectroscopy of Th-229m and an internal-conversion-based solid-state nuclear clock

机译：直接频率梳理光谱的概念，TH-229M和基于内部转换的固态核时钟

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A new concept for narrow-band direct nuclear laser spectroscopy of Th-229m is proposed, using a single comb mode of a vacuum ultraviolet frequency comb generated from the 7th harmonic of an Yb-doped fiber laser system. In this concept more than 10(13 229)Th atoms on a surface are irradiated in parallel and a successful nuclear excitation is probed via the internal-conversion (IC) decay channel. A net scanning time of 15 min for the most recent 1 sigma energy uncertainty interval of 0.34 eV appears to be achievable when searching for the nuclear transition. In case of successful observation, the isomer's energy value would be constrained to an uncertainty of about 100 MHz, which is a factor of 10(6) of improvement compared to today's knowledge. Further, the comb mode could be stabilized to the nuclear transition using the same detection method, allowing for the development of an IC-based solid-state nuclear clock, which is shown to achieve the same performance as a crystal-lattice nuclear clock, however, with the advantage of a drastically simpler detection scheme. Finally, it is shown that the same laser system could be used to narrow down the isomer's transition energy by further six orders of magnitude during laser excitation of Th-229(3+) ions in a Paul trap and to drive nuclear Rabi oscillations, as required for the development of a nuclear clock based on a single Th-229(3+) ion.
机译：提出了一种新的窄带直接核激光光谱学的Th-229M的概念，采用由YB掺杂光纤激光系统的第7次谐波产生的真空紫外线频梳的单一梳模式。在这种概念中，表面上的大于10（1322222）个原子并联照射，并且通过内部转换（IC）衰减通道探测成功的核激发。在寻找核转型时，最近1个Sigma能量不确定性间隔为0.34eV的最新能量不确定性间隔的净扫描时间似乎可以实现。在成功观察的情况下，与当今的知识相比，异构体的能量值将受到约100 MHz的不确定性，这是10（6）个改善的因子。此外，梳模式可以使用相同的检测方法稳定到核转变，从而允许开发基于IC的固态核时钟，这被示出了实现与晶格核时钟相同的性能，但是，具有急剧更简单的检测方案的优点。最后，示出了相同的激光系统可用于通过在Paul陷阱中的Th-229（3+）离子的激光激发期间通过进一步的六个数量级来缩小异构体的过渡能量，并驾驶核Rabi振荡，如基于单个TH-229（3+）离子的核时钟开发核时钟所需。

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