Related Experiment Video
Updated: Sep 10, 2025

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
Published on: December 3, 2013
Dynamic Decoupling Doubles Coherence Times in a Nuclear Spin "Lite" Vanadium(IV) Tris(dithiolate)
Jake McGuire1, Lorenzo Tesi1,2, Burkhard Endeward3
1Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, Stuttgart D-70569, Germany.
Abstract:
The spin dynamics of a tris(dithiolate)vanadium complex dianion and perdeutero-tetraphenylarsonium cation, (AsPh4-d20)2[V(mnt)3], composed of spin-free and weakly magnetic nuclei are investigated in an analogously composed solvent system, CDCl3/Cl3CCN (4:1). This gives the longest reported coherence times for a transition-metal-based spin in deuterated solvents with a T1 of 164(4) ms, and a TM of 60(2) μs. Dynamic decoupling more than doubled TM, resulting in TM = 136(13) μs. The enhancing capabilities of Carr-Purcell and Uhrig-type pulse sequences are compared, revealing significantly different trends. The very limited effectiveness of such dynamic decoupling experiments highlights the need to fully purge the electron-spin environment of magnetic nuclei, and underlines the importance of considering both the fast and slow components of TM. Indeed, the main component (ca. 50-85%) of the decoherence is found to occur with a fast process which drastically shortens the feasibility of extending the number of pulses. This observation further highlights the need to explore dynamic decoupling in tandem with electron-spin environment engineering to eliminate fast decoherence processes.
Related Concept Videos
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
Atomic Nuclei: Types of Nuclear Relaxation
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
NMR Spectroscopy: Spin–Spin Coupling
Valence Bond Theory
Atomic Nuclei: Nuclear Relaxation Processes

