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相关概念视频

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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.
Electromagnetic Waves01:30

Electromagnetic Waves

James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws of electricity and...
Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...
Sampling Theorem01:15

Sampling Theorem

In signal processing, the analysis of continuous-time signals, denoted as x(t), often involves sampling techniques to convert these signals into discrete-time signals. This process is essential for digital representation and manipulation. A critical component in sampling is the train of impulses, characterized by the sampling interval and the sampling frequency. The relationship between these parameters and the original signal's properties dictates the success of the sampling process.
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...
Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...

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相关实验视频

Updated: Jul 17, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
13:31

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

向着奇拉总频谱学发展.

Na Ji1, Victor Ostroverkhov, Mikhail Belkin

  • 1Department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

Journal of the American Chemical Society
|July 6, 2006
PubMed
概括

研究人员展示了奇拉总频 (SF) 光谱,第一次测量了真实和虚拟的SF光谱响应组件. 这种使用1.1'-bi-2-naphthol的技术有助于确定分子配置和形状.

科学领域:

  • 非线性光学是一种非线性光学.
  • 频谱学是一种光谱学.
  • 修身眼的方法 修身眼的方法

背景情况:

  • 总频谱 (SF) 是研究表面和接口的强大技术.
  • 测量SF反应的真实和虚构组件,可以提供更全面的光谱信息.
  • 之前的手术性SF光谱法所能提供的信息有限.

研究的目的:

  • 展示一种新的奇拉总频 (SF) 光谱技术,能够测量SF光谱响应的真实和虚构组成部分.
  • 为了验证该技术,使用一个具有良好的特征的性分子,1.1 -bi-2-naphthol (BN).
  • 为了展示奇拉SF光谱的实用性,以确定绝对配置和形状.

主要方法:

  • 开发一种基于SF信号与无分散的SF参考信号的干扰的奇拉SF光谱法.
  • 该技术应用于1.1 -bi-2-naphthol (BN) 的溶液.
  • 在BN的第一个激子分裂过渡过程中获得奇拉SF光谱.

主要成果:

  • 成功演示了测量真实和虚构组件的奇拉SF光谱学.
  • 在其第一个激子-分裂过渡过程中获得了1,1-bi-2-naphthol (BN) 的奇拉SF光谱.
  • 获得的光谱提供了关于BN的奇拉性质的详细信息.

更多相关视频

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
09:36

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Published on: June 25, 2021

相关实验视频

Last Updated: Jul 17, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
13:31

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
09:36

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Published on: June 25, 2021

结论:

  • 经过证明的手术性SF光谱技术是手术方法的重大进步.
  • 这种技术使得能够更彻底地表征奇拉分子.
  • 奇拉SF光谱对于确定奇拉分子的绝对配置和形状非常有价值.