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Related Concept Videos

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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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Sub-laser-cycle electron pulses for probing molecular dynamics.

Hiromichi Niikura1, F Légaré, R Hasbani

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

Nature
|June 28, 2002
PubMed
Summary
This summary is machine-generated.

Scientists developed a

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

  • Ultrafast science and attosecond physics.
  • Quantum dynamics and molecular interactions.

Background:

  • New time regimes enable novel scientific discoveries.
  • Attosecond (10^-18 to 10^-15 s) measurement capabilities are emerging.
  • High harmonic generation via laser-atom ionization is a leading approach.

Purpose of the Study:

  • To explore the potential of energetic electrons for ultrafast measurements.
  • To investigate electron bunching dynamics in electron-ion collisions.
  • To study the mechanisms of non-sequential double ionization.

Main Methods:

  • Utilized a 'molecular clock' based on a vibrational wave packet in H(2)(+).
  • Analyzed electron-ion collision dynamics.
  • Employed attosecond precision electron control.

Main Results:

  • Demonstrated distinct electron bunches with high current densities and ~1 femtosecond durations.
  • Confirmed the presence of energetic electrons generated with attosecond precision.
  • Provided insights into non-sequential double ionization dynamics.

Conclusions:

  • Energetic electrons can be exploited as probes for ultrafast measurements.
  • The molecular clock is a viable tool for studying electron dynamics.
  • Attosecond electron control is achievable and applicable to complex ionization processes.