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NMR Spectroscopy: Spin–Spin Coupling

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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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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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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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...

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Measuring surface phonons with a 3He spin echo spectrometer: a two-dimensional approach.

P R Kole¹, A P Jardine, H Hedgeland

¹Cavendish Laboratory, University of Cambridge, Cambridge, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|March 15, 2011

Summary

We introduce a novel two-dimensional measurement technique using helium spin echo spectroscopy for studying surface phonons. This method offers ultra-high resolution inelastic scattering analysis, independent of incident beam energy.

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Area of Science:

Surface science
Condensed matter physics
Spectroscopy

Background:

Helium spin echo spectroscopy is a key technique for surface dynamics.
Existing methods for studying surface phonons have limitations.

Purpose of the Study:

To present a new two-dimensional measurement approach for surface phonon studies.
To demonstrate the capability of helium spin echo spectroscopy for ultra-high resolution inelastic scattering.

Main Methods:

Utilizing helium spin echo spectrometer in a novel two-dimensional mode.
Measuring the wavelength intensity matrix.
Analyzing inelastic scattering data independent of incident beam energy distribution.

Main Results:

First two-dimensional measurements of the wavelength intensity matrix.
Demonstration of an approach for ultra-high resolution inelastic scattering.
Insights into surface phonon behavior.

Conclusions:

The new approach offers significant advantages for studying surface phonons.
This technique provides a powerful tool for surface dynamics research.
Comparison with existing methods highlights the benefits and challenges.