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NMR Spectroscopy: Spin–Spin Coupling

NMR Spectroscopy: Spin–Spin Coupling

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...

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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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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...

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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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Related Experiment Video

Updated: Dec 28, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Published on: June 28, 2018

Optical inter-site spin transfer probed by energy and spin-resolved transient absorption spectroscopy.

Felix Willems¹, Clemens von Korff Schmising², Christian Strüber¹

¹Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Strasse 2A, 12489, Berlin, Germany.

Nature Communications

|February 15, 2020

Summary

Optical inter-site spin transfer (OISTR) drives ultrafast magnetization dynamics in CoPt alloys. This efficient spin transport mechanism originates from available electronic states, offering new ways to control magnetic materials.

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Area of Science:

Condensed matter physics
Materials science
Ultrafast magnetism

Background:

Optically driven spin transport offers efficient magnetization manipulation without angular momentum dissipation.
Understanding ultrafast spin dynamics is crucial for advanced magnetic technologies.

Purpose of the Study:

To investigate optical inter-site spin transfer (OISTR) as a dominant mechanism in CoPt alloy magnetization dynamics.
To link OISTR to electronic structure and transient absorption changes.

Main Methods:

Joint theoretical and experimental investigation.
Measurement of helicity-dependent absorption in the extreme ultraviolet (EUV) range.
Analysis of transient spin-split density of states.

Main Results:

OISTR from Platinum (Pt) to Cobalt (Co) is identified as a dominant ultrafast magnetization mechanism.
Helicity-dependent absorption changes correlate directly with spin-split density of states.
The origin of OISTR is linked to minority states above the Fermi level.

Conclusions:

OISTR is a key phenomenon in the optical control of multi-component magnetic systems.
This mechanism provides a pathway for efficient manipulation of magnetization dynamics.
The findings advance the understanding of light-matter interactions in magnetic alloys.