Publication

The determination of all six spectral densities of motion for partially oriented dichloromethane-d2

Geoffrey Bodenhausen
1980
Journal Articles

Abstract

Measurements of spin-lattice relaxation, combined with 2-dimensional measurements of single-and double-quantum spin-echo decay rates, were used to detn. the complete set of spectral d. parameters which characterize D relaxation of CD2Cl2 partially oriented in a nematic liq. crystal (Merck Licristal Phase V). At 31.5 Deg and 9.2 MHz, terms describing cross-correlation between 2 D quadrupole coupling tensors are comparable to the autocorrelation terms. A partial interpretation of these results in terms of anisotropic mol. reorientation and order-director fluctuations is presented and is confirmed by addnl. measurements of the temp. and field dependence of spin-lattice relaxation rates. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/b3100084-cfdf-4b62-b11d-29bc2da38a29

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Geoffrey Bodenhausen
1980
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b3100084-cfdf-4b62-b11d-29bc2da38a29

About this result

Related concepts (32)

Spin–lattice relaxation

During nuclear magnetic resonance observations, spin–lattice relaxation is the mechanism by which the longitudinal component of the total nuclear magnetic moment vector (parallel to the constant magnetic field) exponentially relaxes from a higher energy, non-equilibrium state to thermodynamic equilibrium with its surroundings (the "lattice"). It is characterized by the spin–lattice relaxation time, a time constant known as T1.

Spin–spin relaxation

In physics, the spin–spin relaxation is the mechanism by which Mxy, the transverse component of the magnetization vector, exponentially decays towards its equilibrium value in nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). It is characterized by the spin–spin relaxation time, known as T2, a time constant characterizing the signal decay. It is named in contrast to T1, the spin–lattice relaxation time.

Spectral density

The power spectrum of a time series describes the distribution of power into frequency components composing that signal. According to Fourier analysis, any physical signal can be decomposed into a number of discrete frequencies, or a spectrum of frequencies over a continuous range. The statistical average of a certain signal or sort of signal (including noise) as analyzed in terms of its frequency content, is called its spectrum.

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