Publication

Direct comparison of spin-lattice and spin-spin relaxation in high-resolution NMR

Geoffrey Bodenhausen
1977
Journal Articles

Abstract

A method is presented for the simultaneous measurement of the spin-lattice (T1) and spin-spin (T2) relaxation times in 13C NMR spectroscopy by means of a simple pulse sequence used in conjunction with 2-dimensional Fourier transformation; the resulting spectra give a direct visual indication of the cases of particular interest where T2 < T1. The primary advantage of this method lies in the simultaneous measurement of both T1 and T2 under nearly identical instrumental conditions, e.g., field inhomogeneity and sample temp. The 2-dimensional display provides a convenient visual comparison of the 2 linewidths. In an application of the method, T1 and T2 of 13C were studied in 2 samples of 1,3-butanediol contg. approx. 10-5 and 10-4M MnSO4. The T2 linewidths are within 10% of the T1 linewidths except that in the sample contg. 10-4M Mn2+ the T2 lines of the 2 OH-bearing C atoms have disappeared from the spectrum because of strong preferential broadening. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/b515716e-47b7-407f-be69-6f7c03a8eab9

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Geoffrey Bodenhausen
1977
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b515716e-47b7-407f-be69-6f7c03a8eab9

About this result

Related concepts (32)

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.

Nuclear magnetic resonance spectroscopy

Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy or magnetic resonance spectroscopy (MRS), is a spectroscopic technique to observe local magnetic fields around atomic nuclei. This spectroscopy is based on the measurement of absorption of electromagnetic radiations in the radio frequency region from roughly 4 to 900 MHz. Absorption of radio waves in the presence of magnetic field is accompanied by a special type of nuclear transition, and for this reason, such type of spectroscopy is known as Nuclear Magnetic Resonance Spectroscopy.

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.

Related publications (32)

Direct comparison of spin-lattice and spin-spin relaxation in high-resolution NMR

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