relaxation time

In magnetic resonance spectroscopy the longitudinal relaxation time, $T 1$ , is associated with spin-lattice relaxation, and the transverse relaxation time, $T 2$ , with spin-spin relaxation. The definitions are: $d M z d t = − M z − M z , e T 1$ and $d M x d t = − M x T 2$ , where $M z$ and $M x$ are the components of magnetization parallel and perpendicular to the static field $B$ and the subscript e denotes the equilibrium value.
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Green Book, 2nd ed., p. 25
In a chemical reaction, the time, $τ$ , in which a concentration perturbation falls to $1 e$ of its initial value.

Source:

See also: PAC, 1996, 68, 149 (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 185

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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.

Last update: 2014-02-24; version: 2.3.3.

DOI of this term: https://doi.org/10.1351/goldbook.R05287.

Original PDF version: http://www.iupac.org/goldbook/R05287.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.

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