Theoretical and Computational Framework for the Analysis of the Relaxation Properties of Arbitrary Spin Systems. Application to High-Resolution Relaxometry

Nicolas Bolik-­coulon (1) , Pavel Kadeřávek (1) , Philippe Pelupessy (2) , Jean-Nicolas Dumez (3) , Fabien Ferrage (2) , Samuel F Cousin (1)

1 LBM UMR 7203 - Laboratoire des biomolécules
2 LBM-E3 - Structure et Dynamique des Biomolécules
3 CEISAM - Chimie Et Interdisciplinarité : Synthèse, Analyse, Modélisation

A wide variety of nuclear magnetic resonance experiments rely on the prediction and analysis of relaxation processes. Recently, innovative approaches have been introduced where the sample travels through a broad range of magnetic fields in the course of the experiment, such as dissolution dynamic nuclear polarization or high-resolution relaxometry. Understanding the relaxation properties of nuclear spin systems over orders of magnitude of magnetic fields is essential to rationalize the results of these experiments. For example, during a high-resolution relaxometry experiment, the absence of control of nuclear spin relaxation pathways during the sample transfers and relaxation delays leads to systematic deviations of polarization decays from an ideal mono-exponential decay with the pure longitudinal relaxation rate. These deviations have to be taken into account to describe quantitatively the dynamics of the system. Here, we present computational tools to (1) ⇤ Corresponding authors Email addresses: [e-mail] (Jean-Nicolas Dumez), [e-mail] (Fabien Ferrage), [e-mail] (Samuel F. Cousin) calculate analytical expressions of relaxation rates for a broad variety of spin systems and (2) use these analytical expressions to correct the deviations arising in high-resolution relaxometry experiments. These tools lead to a better understanding of nuclear spin relaxation, which is required to improve the sensitivity of many pulse sequences, and to better characterize motions in macromolecules.

Mots clés: Nuclear Spin Relaxation; Analytical Relaxation Computation; High-Resolution Relaxometry

Domaines: Chimie

Nicolas Bolik-­coulon, Pavel Kadeřávek, Philippe Pelupessy, Jean-Nicolas Dumez, Fabien Ferrage, et al.. Theoretical and Computational Framework for the Analysis of the Relaxation Properties of Arbitrary Spin Systems. Application to High-Resolution Relaxometry. Journal of Magnetic Resonance, 2020, 313, pp.106718. ⟨10.1016/j.jmr.2020.106718⟩. ⟨hal-02986164⟩