Spin noise gradient echoes

Victor V. Rodin (1) , Stephan J. Ginthör (1) , Matthias Bechmann (1) , Hervé Desvaux (2) , Norbert Müller (1, 3)

1 Institute of Organic Chemistry
2 LSDRM - Laboratoire Structure et Dynamique par Résonance Magnétique (LCF)
3 Faculty of Sciences, University of South Bohemia, České Budějovice (Budweis)

Nuclear spin noise spectroscopy in the absence of radio frequency pulses was studied under the influence of pulsed field gradients (PFGs) on pure and mixed liquids. Under conditions where the radiation-damping-induced line broadening is smaller than the gradient-dependent inhomogeneous broadening, echo responses can be observed in difference spectra between experiments employing pulsed field gradient pairs of the same and opposite signs. These observed spin noise gradient echoes (SNGEs) were analyzed through a simple model to describe the effects of transient phenomena. Experiments performed on high-resolution nuclear magnetic resonance (NMR) probes demonstrate how refocused spin noise behaves and how it can be exploited to determine sample properties. In bulk liquids and their mixtures, transverse relaxation times and translational diffusion constants can be determined from SNGE spectra recorded following tailored sequences of magnetic field gradient pulses.

Domains: Material chemistry

Victor V. Rodin, Stephan J. Ginthör, Matthias Bechmann, Hervé Desvaux, Norbert Müller. Spin noise gradient echoes. Magnetic Resonance, 2021, 2, pp.827-834. ⟨10.5194/mr-2-827-2021⟩. ⟨cea-03445147⟩