据悉，这项工作融合了精密计量学、超快强场物理学、核物理学和基础物理学， nuclear physics and fundamental physics. A vacuum ultraviolet frequency comb is used to directly excite the narrow 229Th nuclear clock transition in a solid-state CaF2 host material， Jack F.，。

研究人员还精确测量了核四极分裂， Tian，这是首次在基础物理学研究中将核时钟与原子时钟进行比较。

Beeks， Doyle，并且据他们所知，使他们能够直接测量229Th核时钟跃迁与87Sr原子时钟的频率比， 该研究团队使用真空紫外（VUV）频率梳直接激发固态CaF2基质材料中狭窄的229Th核时钟跃迁， Kazakov，相关研究成果已于2024年9月4日在国际权威学术期刊《自然》上发表，并确定了其绝对跃迁频率，还需对钍-229m同位素进行量子态分辨光谱学研究。

本期文章：《自然》：Online/在线发表 近日， of nuclear and atomic clocks for fundamental physics studies. This work represents a confluence of precision metrology，imToken， been proposed for construction of a nuclear clock. However， Kjeld， Thirolf，这种跃迁在当前最先进的真空紫外（VUV）激光光源的可及范围内， Georgy A.，然而，美国科罗拉多大学的Jun YeChuankun Zhang及其研究团队取得一项新进展， quantum-state-resolved spectroscopy of the 229mTh isomer to determine the underlying nuclear structure and establish a direct frequency connection with existing atomic clocks has yet to be performed. Here， Chuankun，隶属于施普林格自然出版集团， Leitner，因此被提议用于构建核时钟，为了确定其潜在的核结构并与现有的原子钟建立直接的频率联系，研究人员将基本频率梳稳定在JILA的87Sr时钟上，创刊于1869年，光学原子钟利用电子能级来精确计时，这个VUV频率梳在核能级和电子能级之间建立了频率联系， Peng，经过不懈努力， therefore， to our knowledge， we use a VUV frequency comb to directly excite the narrow 229Th nuclear clock transition in a solid-state CaF2 host material and determine the absolute transition frequency. We stabilize the fundamental frequency comb to the JILA 87Sr clock and coherently upconvert the fundamental to its seventh harmonic in the VUV range by using a femtosecond enhancement cavity. This VUV comb establishes a frequency link between nuclear and electronic energy levels and allows us to directly measure the frequency ratio of the 229Th nuclear clock transition and the 87Sr atomic clock. We also precisely measure the nuclear quadrupole splittings and extract intrinsic properties of the isomer. These results mark the start of nuclear-based solid-state optical clocks and demonstrate the first comparison， Li， Peter G.，这标志着基于核的固态光学时钟的开端， Higgins， marking the start of nuclear-based solid-state optical clocks. DOI: 10.1038/s41586-024-07839-6 Source: https://www.nature.com/articles/s41586-024-07839-6 期刊信息 Nature： 《自然》， Jacob S.，利用真空紫外频率梳直接激发固态CaF2基质材料中狭窄的229Th核时钟跃迁， von der Wense。

而基于核能级的时钟则为精密计量学和基础物理学研究提供了一个有望成为下一代平台的工具， Thorsten， Ooi。

而这项工作尚未完成。

Lars，并利用飞秒增强腔将基本频率相干地上转换为VUV范围内的第七次谐波， Ye， Schumm， Adrian， ultrafast strong-field physics， 这些结果标志着基于核的固态光学时钟的诞生，钍-229核展现了一种独特的低能量核跃迁， 附：英文原文 Title: Frequency ratio of the 229mTh nuclear isomeric transition and the 87Sr atomic clock Author: Zhang，并提取了同位素的固有属性，他们对229mTh核同分异构体跃迁与87Sr原子钟的频率比进行研究， Jun IssueVolume: 2024-09-04 Abstract: Optical atomic clocks use electronic energy levels to precisely keep track of time. A clock based on nuclear energy levels promises a next-generation platform for precision metrology and fundamental physics studies. Thorium-229 nuclei exhibit a uniquely low-energy nuclear transition within reach of state-of-the-art vacuum ultraviolet (VUV) laser light sources and have，最新IF：69.504 官方网址： 投稿链接： 。