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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Related Experiment Video

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

Dynamic imaging of molecules using high order harmonic generation.

Jon P Marangos1, Sarah Baker, Nathaniel Kajumba

  • 1Blackett Laboratory, Imperial College London, Prince Consort Road, South Kensington, London, UKSW7 2BZ. j.marangos@imperial.ac.uk

Physical Chemistry Chemical Physics : PCCP
|December 14, 2007
PubMed
Summary

High harmonic generation (HHG) from molecules offers insights into electronic wavefunctions and nuclear dynamics. This review highlights experimental and theoretical advances in using HHG for molecular imaging.

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Area of Science:

  • Quantum mechanics
  • Molecular physics
  • Attosecond science

Background:

  • High harmonic generation (HHG) is a nonlinear optical process.
  • HHG involves the emission of high-energy photons when atoms or molecules interact with intense laser fields.
  • Understanding HHG is crucial for probing ultrafast molecular dynamics.

Purpose of the Study:

  • To review recent advancements in imaging molecular electronic wavefunctions and nuclear dynamics.
  • To explain the fundamental principles of HHG in molecules for a non-specialist audience.
  • To present specific experimental and theoretical studies on HHG in molecules.

Main Methods:

  • Theoretical modeling of high harmonic emission.
  • Experimental measurements of HHG from molecules.
  • Utilizing fixed-orientation molecules to probe electronic structure.
  • Employing HHG to track ultrafast proton rearrangement dynamics.

Main Results:

  • HHG emission is fundamentally linked to the recombination amplitude of electronic wavefunctions.
  • HHG can reveal signatures of molecular electronic structure.
  • HHG enables tracking of extremely fast proton rearrangement after ionization.

Conclusions:

  • HHG is a powerful tool for imaging molecular electronic and nuclear dynamics.
  • Recent experimental and theoretical work has significantly advanced the application of HHG in molecular science.
  • HHG provides a unique window into ultrafast processes in molecules.