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Related Concept Videos

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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¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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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.
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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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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Emission Spectra02:39

Emission Spectra

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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Extracting sub-cycle electronic and nuclear dynamics from high harmonic spectra.

Dane R Austin1, Allan S Johnson1,2, Felicity McGrath1

  • 1Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2AZ, UK.

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We developed a new spectroscopy method to measure ultrafast electron and nuclear motion in atoms and molecules. This technique reveals electron flux evolution and nuclear dynamics in ionized atoms and benzene molecules.

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Area of Science:

  • Quantum dynamics
  • Attosecond science
  • Molecular spectroscopy

Background:

  • Understanding ultrafast electron and nuclear dynamics is crucial for controlling chemical reactions.
  • Existing methods often require aligned samples or make significant assumptions about the system.

Purpose of the Study:

  • To introduce a novel multidimensional high harmonic generation (HHG) spectroscopy technique for measuring femtosecond dynamics.
  • To apply this method to atoms and molecules, revealing previously unobserved phenomena.

Main Methods:

  • Utilizing multidimensional high harmonic generation (HHG) spectroscopy.
  • Recording spectra as a function of laser intensity to create a two-dimensional data set.
  • Applying the method to xenon atoms and benzene molecules.

Main Results:

  • Observed the sub-cycle evolution of returning electron flux in strong-field ionized xenon atoms.
  • Extracted the nuclear autocorrelation function in strong-field ionized benzene cations, showing a decay of [Formula: see text] fs.
  • Validated results against theoretical calculations, showing good agreement.

Conclusions:

  • The new HHG spectroscopy method provides a powerful tool for probing ultrafast dynamics in atoms and molecules.
  • The technique is minimally assumption-based and applicable to un-aligned polyatomic molecules.
  • Direct observation of electron flux evolution and nuclear dynamics is now possible.