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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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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...
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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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.
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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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...
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Updated: Jun 13, 2025

Gradient Echo Quantum Memory in Warm Atomic Vapor
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Transverse echo effect induced multiple harmonic generation scheme in an electron storage ring.

Changliang Li1, Bocheng Jiang2, Yao Zhang3

  • 1Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, China.

Scientific Reports
|September 10, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for multiple harmonic generation, significantly boosting harmonic numbers. This advance enables the production of coherent extreme ultraviolet radiation within storage rings.

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Area of Science:

  • Physics
  • Accelerator Physics
  • Quantum Optics

Background:

  • Coherent radiation generation relies on multiple harmonic generation from modulated electron beams.
  • Enhancing harmonic numbers is crucial for advanced radiation sources.

Purpose of the Study:

  • To investigate a new scheme for multiple harmonic generation.
  • To enhance the generation of coherent extreme ultraviolet radiation in storage rings.

Main Methods:

  • Combining angular dispersion-induced microbunching (ADM) with the transverse echo effect.
  • Utilizing pulsed magnets (dipoles, quadrupoles, multipoles) in a multi-bend achromatic storage ring.
  • Performing simulation studies to validate the scheme.

Main Results:

  • Demonstrated a tripled harmonic number compared to pure ADM.
  • Successfully simulated the generation of coherent extreme ultraviolet radiation.

Conclusions:

  • The proposed scheme effectively enhances multiple harmonic generation.
  • This method offers a viable pathway for producing coherent extreme ultraviolet radiation in storage rings.