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relaxation time

  1. 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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  2. In a chemical reaction, the time, τ, in which a concentration perturbation falls to 1 e of its initial value.
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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. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi: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 The PDF version is out of date and is provided for reference purposes only.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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