Quadrupolar relaxation. The multiquantum coherences

Werbelow, Lawrence G.; Pouzard, Guy

doi:10.1021/j150625a035

Cited by 59 publications

(41 citation statements)

References 2 publications

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“…The even-rank quadrupolar spin polarization is decoupled from any other tensor operator [25] and its time evolution takes the form [26] with rate…”

Section: Spin Polarizationmentioning

confidence: 99%

“…The fast and the slowly relaxing components with relaxation eigenvalues R 1 (Ϯ1) and R 2 (Ϯ1) are dynamically shifted with respect to the Larmor frequency with shifts K 1 and K 2 Ϫ K 1 , respectively. Accordingly, the spectra resulting from Fourier transformation of the relaxation functions are generally a sum of two Lorentzians separated by the difference of the dynamic shifts pertaining to the central and outer transitions of the spin-3/2 manifold 2K 1 -K 2 (26,27). In practice, this dynamic shift usually is much smaller than the line widths and notoriously difficult to detect (28,29).…”

Section: Single-quantummentioning

confidence: 99%

“…The resulting sets of coupled differential equations are the same as the ones for spin 3/2 in the isotropic environment and their solutions are given by Eqs. [22] and [26].…”

Section: Spin Polarizationmentioning

confidence: 99%

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Thermal relaxation and coherence dynamics of spin 3/2. I. Static and fluctuating quadrupolar interactions in the multipole basis

Maarel

2003

Concepts Magnetic Resonance

178

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ABSTRACT:The relaxation dynamics of the spin 3/2 density operator in the presence of fluctuating and static quadrupolar interactions is reviewed. The nuclear magnetic resonance (NMR) line shapes are analyzed for any value of the static quadrupolar interaction, ranging from isotropic systems to systems exhibiting large splitting far exceeding the line widths. Pulse sequences optimized for the elimination of line broadening due to an inhomogeneous static quadrupolar interaction and for the detection of nuclei involved in slow molecular motion and/or in anisotropic, liquid crystalline environment are discussed. In Part II, the dynamics of spin 3/2 in the presence of a (pulsed) radio frequency (RF) field is reviewed.

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“…The even-rank quadrupolar spin polarization is decoupled from any other tensor operator [25] and its time evolution takes the form [26] with rate…”

Section: Spin Polarizationmentioning

confidence: 99%

Section: Single-quantummentioning

confidence: 99%

See 1 more Smart Citation

Thermal relaxation and coherence dynamics of spin 3/2. I. Static and fluctuating quadrupolar interactions in the multipole basis

Maarel

2003

Concepts Magnetic Resonance

178

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“…Once created, the highest order 2I-quantum coherences of any nuclei are not influenced by static quadrupolar effects and, hence, exhibit a long decay solely influenced by spin relaxation. 99 As an additional advantage, gradients affect higher quantum coherences proportional to their quantum order, thereby increasing the efficiency of gradient encoding/decoding. For I > 1 nuclei with half-integer spins one can nevertheless exploit single-quantum coherences through the relatively narrow central line in a conventional spin-echo experiment.…”

Section: Efficiency Of Gradient Encoding: Refocusing and Decoupling Tmentioning

confidence: 99%

NMR methods applied to anisotropic diffusion

Furó

Dvinskikh

2002

Magnetic Reson in Chemistry

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The methodology of NMR experiments intended to measure anisotropic diffusion is reviewed. Experiments of this kind preferably require oriented samples and/or orientation-dependent spin coupling and/or magnetic field gradients in different directions. One strategy of diffusion experiments in anisotropic systems with broad NMR lines employs line narrowing techniques, thereby allowing for efficient gradient encoding/decoding. Depending on the nuclei, spin couplings and samples, the preferred methods vary from decoupling through echo techniques to magic angle sample orientation and spinning. Another avenue to efficient gradient encoding/decoding is through very strong magnetic field gradients. Either way, anisotropic diffusion reveals new structural features as illustrated by a few selected examples in liquid crystals and in biological tissues.

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“…The equilibrium bulk magnetization density of N identical I = 1/2 spins is: 102) where the net thermal spin polarization of I = 1/2 nuclei is:…”

Section: Density Operator Theory and Propagation 66mentioning

confidence: 99%

Nuclear magnetic resonance studies of quadrupolar nuclei and dipolar field effects

Urban

2004

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Experimental and theoretical research conducted in two areas in the field of nuclear magnetic resonance (NMR) spectroscopy is presented: (1) studies of the coherent quantummechanical control of the angular momentum dynamics of quadrupolar (spin I > 1/2) nuclei and its application to the determination of molecular structure; and (2) applications of the long-range nuclear dipolar field to novel NMR detection methodologies.The dissertation is organized into six chapters. The first two chapters and associated appendices are intended to be pedagogical and include an introduction to the quantum mechanical theory of pulsed NMR spectroscopy and the time dependent theory of quantum mechanics.The third chapter describes investigations of the solid-state multiple-quantum magic angle spinning (MQMAS) NMR experiment applied to I = 5/2 quadrupolar nu-2 clei. This work reports the use of rotary resonance-matched radiofrequency irradiation for sensitivity enhancement of the I = 5/2 MQMAS experiment. These experiments exhibited certain selective line narrowing effects which were investigated theoretically.The fourth chapter extends the discussion of multiple quantum spectroscopy of quadrupolar nuclei to a mostly theoretical study of the feasibility of enhancing the resolution of nitrogen-14 NMR of large biomolecules in solution via double-quantum spectroscopy.The fifth chapter continues to extend the principles of multiple quantum NMR spectroscopy of quadrupolar nuclei to make analogies between experiments in NMR/nuclear quadrupolar resonance (NQR) and experiments in atomic/molecular optics (AMO). These analogies are made through the Hamiltonian and density operator formalism of angular momentum dynamics in the presence of electric and magnetic fields.The sixth chapter investigates the use of the macroscopic nuclear dipolar field to encode the NMR spectrum of an analyte nucleus indirectly in the magnetization of a sensor nucleus. This technique could potentially serve as an encoding module for the recently developed NMR remote detection experiment. The feasibility of using hyperpolarized xenon-129 gas as a sensor is discussed. This work also reports the use of an optical atomic magnetometer to detect the nuclear magnetization of Xe-129 gas, which has potential applicability as a detection module for NMR remote detection experiments.

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Quadrupolar relaxation. The multiquantum coherences

Cited by 59 publications

References 2 publications

Thermal relaxation and coherence dynamics of spin 3/2. I. Static and fluctuating quadrupolar interactions in the multipole basis

Thermal relaxation and coherence dynamics of spin 3/2. I. Static and fluctuating quadrupolar interactions in the multipole basis

NMR methods applied to anisotropic diffusion

Nuclear magnetic resonance studies of quadrupolar nuclei and dipolar field effects

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