Theory of nuclear magnetic relaxation

McConnell, James R.

doi:10.1016/0032-3861(85)90029-1

Cited by 31 publications

(63 citation statements)

References 8 publications

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“…For a detailed derivation and discussion and more details we refer the interested reader to the secondary literature about spin relaxation [25,[49][50][51][52][53]. The full system Hamiltonian in the laboratory frame is written as (1) where the deterministic Hamiltonian in the laboratory frame usually consists of a static part (Zeeman interaction and isotropic interactions) and a time-dependent part that represents the radio-frequency irradiation of the spins.…”

Section: Semi-classical Derivation Of the Master Equation-mentioning

confidence: 99%

“…In the presence of conformational exchange that modulates the isotropic chemical shift of the two nuclei by Δω I and Δω S , the chemical-shift modulation of the zero-quantum coherence is and the corresponding chemical-shift difference for the double-quantum term is . The differential MQ relaxation rate constant in the case of a two-site exchange is given by [131]: (51) Here, p A and p B are the relative populations of the two states, and k ex is the exchange rate constant defined by (k ex = k AB +k BA = k BA (1+p B /p A )), where k AB and k BA are forward and backward rate constants.…”

Section: Csa/dipole Interferencementioning

confidence: 99%

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Studying dynamics by magic-angle spinning solid-state NMR spectroscopy: Principles and applications to biomolecules

Schanda

Ernst

2016

Progress in Nuclear Magnetic Resonance Spectroscopy

187

295

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Magic-angle spinning solid-state NMR spectroscopy is an important technique to study molecular structure, dynamics and interactions, and is rapidly gaining importance in biomolecular sciences. Here we provide an overview of experimental approaches to study molecular dynamics by MAS solid-state NMR, with an emphasis on the underlying theoretical concepts and differences of MAS solid-state NMR compared to solution-state NMR. The theoretical foundations of nuclear spin relaxation are revisited, focusing on the particularities of spin relaxation in solid samples under magic-angle spinning. We discuss the range of validity of Redfield theory, as well as the inherent multi-exponential behavior of relaxation in solids. Experimental challenges for measuring relaxation parameters in MAS solid-state NMR and a few recently proposed relaxation approaches are discussed, which provide information about time scales and amplitudes of motions ranging from picoseconds to milliseconds. We also discuss the theoretical basis and experimental measurements of anisotropic interactions (chemical-shift anisotropies, dipolar and quadrupolar couplings), which give direct information about the amplitude of motions. The potential of combining relaxation data with such measurements of dynamically-averaged anisotropic interactions is discussed. Although the focus of this review is on the theoretical foundations of dynamics studies rather than their application, we close by discussing a small number of recent dynamics studies, where the dynamic properties of proteins in crystals are compared to those in solution.

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Section: Semi-classical Derivation Of the Master Equation-mentioning

confidence: 99%

Section: Csa/dipole Interferencementioning

confidence: 99%

Studying dynamics by magic-angle spinning solid-state NMR spectroscopy: Principles and applications to biomolecules

Schanda

Ernst

2016

Progress in Nuclear Magnetic Resonance Spectroscopy

187

295

View full text Add to dashboard Cite

show abstract

“…In this manner, the water saturation of bitumen sample at each temperature was estimated by using Eq. [18].…”

Section: Estimated Water Saturation In Sample At Different Temperaturesmentioning

confidence: 99%

“…The intramolecular dipole-dipole interaction mechanism is due to the interaction of nuclei in the same molecule. If the molecule is regarded as rigid, results from the rotational motion of the molecule [18]. For spherical molecules, the relaxation times by the intramolecular dipole-dipole interaction are expressed as [18]: …”

Section: Estimated Viscosity Of Bitumen At Different Temperaturesmentioning

confidence: 99%

Fluid-Rock Characterization for NMR Well Logging and Special Core Analysis

Hirasaki¹,

Mohanty²

2007

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“…In order to describe the NOESY experiment (Jeener et al, 1979) and to lay the foundation for the dynamics data in chapter 3, this section will deal with some aspects of relaxation in NMR (Abragam, 1961;McConnell, 1987;Goldman, 1988;van de Ven, 1995).…”

Section: Relaxation and The Noementioning

confidence: 99%

Structural studies of the activation of the two component receiver domain NTRC by multidimensional heteronuclear NMR

Nohaile

1996

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Theory of nuclear magnetic relaxation

Cited by 31 publications

References 8 publications

Studying dynamics by magic-angle spinning solid-state NMR spectroscopy: Principles and applications to biomolecules

Studying dynamics by magic-angle spinning solid-state NMR spectroscopy: Principles and applications to biomolecules

Fluid-Rock Characterization for NMR Well Logging and Special Core Analysis

Structural studies of the activation of the two component receiver domain NTRC by multidimensional heteronuclear NMR

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