Extending Timescales and Narrowing Linewidths in NMR

Extending timescales and narrowing linewidths in NMR.

Among the different fields of research in nuclear magnetic resonance (NMR) which are currently investigated in the Laboratory of Biomolecular Magnetic Resonance (LRMB), two subjects that are closely related to each other are presented in this article. On the one hand, we show how to populate long-lived states (LLS) that have long lifetimes T(LLS) which allow one to go beyond the usual limits im...

Long-lived coherences for line-narrowing in high-field NMR.

a School of Chemistry, University of Southampton, Southampton SO17 1BJ, England b Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, EPFL, Batochime, 1015 Lausanne, Switzerland Université Paris Descartes, UMR 8601 CNRS, 45, rue des Saints Pères 75006, Paris, France Université Pierre-et-Marie Curie, Paris, France Département de Chimie, Ecole Normale Supérieu...

Ab initio Study of Nitrogen-14 Nuclear Quadrupole Coupling and NMR Signal Linewidths in Some Azoles*

Ab initio values of Nitrogen N Nuclear Quadrupole Coupling Constants (NQCC's) are calculated for a series of methyl-substituted azoles in the Multiconfigurational SCF (MCSCF) approximation. The four triazoles and two tetrazoles studied here are all isoelectronic. This enabled us to use the same level of approximation basis set and active space for all the molecules. The computed NQCC's are used...

Antiferromagnetic correlations and impurity broadening of NMR linewidths in cuprate superconductors

We study a model of a d-wave superconductor with strong potential scatterers in the presence of antiferromagnetic correlations and apply it to experimental nuclear magnetic resonance NMR results on Zn impurities in the superconducting state of YBa2Cu3O7− . We then focus on the contribution of impurity-induced paramagnetic moments, with Hubbard correlations in the host system accounted for in Ha...

Completeness of Extending Unification Based on Basic Narrowing