相关实验视频
Updated: Jul 16, 2025

11:21
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
7.5K
使用光学拉姆齐技术测量超细结构和泽马赫半径在6Li^{+}
Wei Sun1,2, Pei-Pei Zhang1, Peng-Peng Zhou1,2,3
1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China.
Physical review letters
|September 22, 2023
概括
我们精确地测量了离子 (Li+) 中的原子转换,显著改善了超细分离数据. 这导致了精细的核尺寸测量,挑战了以前的模型.
科学领域:
- 原子物理 原子物理
- 量子电动力学 (QED) 是一个
- 核物理 核物理 核物理
背景情况:
- 准确的原子光谱对于测试基本理论至关重要.
- 之前对Li+中超精细分裂的测量有显著的不确定性.
- 核性质的实验和理论值之间存在差异.
研究的目的:
- 为了实现2^{3}S_{1}-2^{3}P_{J}转换在6Li^{+}离子中的高精度测量.
- 为了完善2^{3}S_{1}和2^{3}P_{J}状态的超细分.
- 为了确定Li核的Zemach半径的改进值.
主要方法:
- 利用光学拉姆齐技术进行高精度光谱学.
- 测量了特定原子状态的超细分离,以 ^{6}Li^{+} 离子.
- 将实验数据与量子电动力学 (QED) 计算结合起来.
主要成果:
- 在6Li^{+}中获得了2^{3}S_{1}和2^{3}P_{J}状态的超精细分割的最精确值,不确定性低至10kHz.
- 对2^{3}S_{1}和2^{3}P_{J}状态分别减少了5和50的实验不确定性.
- 确定Li核的改进的泽马赫半径为2.44 fm,显示与更简单的核模型的不同意.
结论:
- 高精度的测量验证了先进的QED计算.
- 确定的泽马赫半径挑战了现有的核模型,强调了需要更复杂的核物理输入的需要.
- 为了确定李泽马赫半径,需要对核结构进行进一步的研究.
相关概念视频
Trends in Lattice Energy: Ion Size and Charge
24.0K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
24.0K
Raman Spectroscopy Instrumentation: Overview
449
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
449
Raman Spectroscopy: Overview
439
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
439
NMR Spectrometers: Resolution and Error Correction
719
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
719

