相关实验视频
Updated: Aug 23, 2025

10:42
Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
6.8K
一个基于高电荷离子的光学原子钟
Steven A King1,2, Lukas J Spieß3, Peter Micke1,4,5
1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany.
Nature
|November 3, 2022
概括
研究人员开发了一种使用高电荷离子 (HCI),特别是-13加 (Ar13+) 的新光学原子钟. 这一突破为基础物理测试和寻找超越标准模型的新物理提供了前所未有的准确性.
科学领域:
- 原子物理
- 测量学
- 量子电动力学
背景情况:
- 光学原子钟是具有广泛应用的领先测量设备.
- 高电荷离子 (HCI) 具有独特的原子特性,可提高时钟性能并降低环境敏感性.
研究的目的:
- 通过使用高电荷离子实现一类新的光学时钟.
- 在HCI中建立禁止的光学转换作为高精度时钟和基本物理测试的参考.
主要方法:
- 在Ar13+中基于磁双极转换的光学原子钟的开发.
- 对系统频率不确定性的全面评估.
- 时钟比较以改善过渡频率和同位素转移的不确定性.
主要成果:
- Ar13+时钟的系统频率不确定性为2.2 × 10^-17,与现有的光学时钟相美.
- 绝对过渡频率和同位素转移的不确定性分别提高了八个和九个数量级.
- 研究了量子电动力学 (QED) 核反弹效应,将理论不确定性降低了三倍.
结论:
- 在HCI中禁止的光学转换被确立为尖端光学时钟的可行参考.
- 这项研究为未来超越标准模型的高灵敏性物理研究铺平了道路.
- 在精度测量和基本物理探索方面,
相关概念视频
Atomic Nuclei: Larmor Precession Frequency
1.6K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
1.6K
The Bohr Model
61.6K
Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as...
61.6K
Atomic Emission Spectroscopy: Instrumentation
567
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
567
The Quantum-Mechanical Model of an Atom
42.8K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
42.8K
Mass Analyzers: Common Types
681
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
681
Atomic Nuclei: Nuclear Spin
2.3K
All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
2.3K

