相关实验视频
Updated: Jan 14, 2026

11:53
Purification and Reconstitution of TRPV1 for Spectroscopic Analysis
Published on: July 3, 2018
8.4K
脉冲加热在时间分辨率EPR光谱中的应用,用于纵向放松测量
Anatoly R Melnikov1, Alexander G Maryasov2, Anastasia S Ishchenko1,3
1International Tomography Center of the Siberian Branch of the Russian Academy of Sciences, 3a, Institutskaya Str., Novosibirsk 630090, Russian Federation.
The Journal of chemical physics
|October 23, 2025
概括
我们介绍了特拉赫兹 (THz) 脉冲加热的过渡电子磁共振 (TR EPR) 光谱法,用于测量自旋格子放松时间 (T1). 这种方法准确地确定了对磁性系统中的T1,这对于量子计算应用至关重要.
科学领域:
- 量子物理学的量子物理学
- 频谱学是一种光谱学.
- 材料科学是一种材料科学.
背景情况:
- 过渡性电子磁共振 (TR EPR) 光谱学研究光生成的磁共振物种.
- 旋转格子放松时间 (T1) 对单分子磁铁和分子旋转量子比特至关重要.
- 太赫兹 (THz) 辐射可以启动自旋动力学,而不会产生新的偏磁物种.
研究的目的:
- 以脉冲THz加热的TR EPR光谱作为确定T1.1的通用方法.
- 开发一个数值模型来定义该方法的范围.
- 将这种新方法与现有技术进行比较.
主要方法:
- 使用脉冲THz加热的TR EPR光谱.
- 基于Liouville-von Neumann方程的数值建模. 这是一个非常好的方法.
- 使用[CoTp2] (S = 3/2) 的实验验证.
- 与交流磁力测量和脉冲EPR进行比较.
主要成果:
- 使用THz脉冲的TR EPR光谱学可以准确地确定偏磁系统中的T1.
- 该方法显示了T1.1的方向依赖性.
- 结果与交流磁力测量和脉冲EPR质量一致,提供了补充数据.
- 交流磁力测量揭示了T1.1.的磁场依赖性.
- 脉冲EPR受到光谱扩散的影响.
结论:
- THz脉冲加热TR EPR是一种多功能且准确的T1测定方法.
- 与其他方法相比,这种技术提供了对放松动态的补充见解.
- 了解T1对于推进分子自旋量子比特和量子技术至关重要.
相关概念视频
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
1.7K
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
1.7K
Atomic Nuclei: Types of Nuclear Relaxation
906
Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
906
Double Resonance Techniques: Overview
696
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
696
¹H NMR of Labile Protons: Temporal Resolution
1.7K
Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
1.7K
NMR Spectrometers: Resolution and Error Correction
1.0K
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...
1.0K
2D NMR: Overview of Homonuclear Correlation Techniques
616
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
COSY90 is the standard two-dimensional (2D) COSY experiment that...
616

