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Spin–Spin Coupling Constant: Overview

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...

The Quantum-Mechanical Model of an Atom

The Quantum-Mechanical Model of an Atom

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.

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

Spin–Spin Coupling: One-Bond Coupling

Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...

The Pauli Exclusion Principle

The Pauli Exclusion Principle

The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:

Atomic Nuclei: Nuclear Spin State Overview

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...

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相关实验视频

Updated: Jul 17, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

一个旋转机械量子芯片用于探索异国情调的相互作用.

Longhao Wu^1,2, Shaochun Lin^1,2, Xi Kong³

¹Chinese Academy of Sciences Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China.

Proceedings of the National Academy of Sciences of the United States of America

|August 28, 2023

概括

此摘要是机器生成的。

科学家们开发了一种新的量子芯片来寻找暗物质. 这种旋转机械装置显著提高了检测异国情调相互作用的灵敏度,推动了基础物理研究.

关键词:

暗物质是什么?暗物质是什么?异国情调的相互作用异国情调的相互作用.一个量子芯片.量子磁力计是量子磁力计.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

相关实验视频

Last Updated: Jul 17, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

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Published on: November 1, 2013

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

科学领域:

基本物理基本物理
粒子物理学粒子物理学
量子技术量子技术是一个量子技术.

背景情况:

寻找暗物质,这是基础科学中一个主要的未解决的问题,通常涉及到探索超越标准模型的相互作用.
之前使用实验室规模和桌面设置的实验没有检测到这种异国情调的相互作用,这凸显了需要更敏感的检测方法.
提高实验灵敏度对于暗物质粒子搜索至关重要,但具有挑战性.

研究的目的:

提出和演示一种新的自旋力学量子芯片,用于增强暗物质检测.
探索超越标准模型的异国情调的旋转速度依赖相互作用.
为芯片基础物理实验建立一个可扩展的平台.

主要方法:

在微观尺度上设计和实现一个自旋力学量子芯片,集成一个机械共振器和一个空白钻石.
使用原型芯片对旋转速度依赖的相互作用设置约束.
利用可扩展的芯片内探测器来提高灵敏度.

主要成果:

提高了两个数量级的自旋速度依赖相互作用的约束.
没有发现100纳米以下的力范围 (2-10电子伏特静止质量窗口) 中新玻色子的证据.
证明了一个原则证明实验的潜力.

结论:

开发的量子芯片提供了一个有希望的,可扩展的平台,以寻找具有卓越灵敏度的异国情调相互作用.
芯片规模的设置可以加速暗物质的探索,因为它们的成本低,产量高.
这种方法为未来的芯片基础物理实验铺平了道路.