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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.

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相关实验视频

Updated: Jul 8, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

亚激光周期电子脉冲用于探测分子动力学.

Hiromichi Niikura1, F Légaré, R Hasbani

  • 1National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A OR6, Canada.

Nature
|June 28, 2002
PubMed
概括

科学家们开发了一个

科学领域:

  • 超快的科学和一秒钟的物理.
  • 量子动力学和分子相互作用.

背景情况:

  • 新的时间制度使新的科学发现成为可能.
  • 每秒 (10^-18到10^-15秒) 的测量能力正在出现.
  • 通过激光原子电离产生高波是一种领先的方法.

研究的目的:

  • 探索高能电子的潜力,以进行超快速测量.
  • 为了研究电子-离子碰撞中的电子集群动力学.
  • 研究非顺序双电离的机制.

主要方法:

  • 利用一个'分子时钟'基于一个振动波包在H(2)(+).
  • 分析了电子离子碰撞动态.
  • 用于秒精度电子控制.

主要成果:

  • 证明了具有高电流密度和~1 femtosecond持续时间的独特电子束.
  • 证实了能量电子的存在,这些电子以每秒的精度产生.
  • 提供了对非顺序双离子化动态的见解.

结论:

  • 能量电子可以被利用作为超快速测量的探测器.

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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

相关实验视频

Last Updated: Jul 8, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Published on: February 4, 2017

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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

Published on: October 23, 2018

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
08:22

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

  • 分子时钟是研究电子动态的一个可行的工具.
  • 八秒电子控制是可以实现的,适用于复杂的电离过程.