spin echo 

Synonym: Hahn echo
Initialism: SE
https://doi.org/10.1351/goldbook.08420
Refocusing of spin magnetization usually by two consecutive radiofrequency pulses.
Notes:
  1. The simplest form of the spin-echo pulse sequence consists of 90 ∘ pulse, a 180 ∘ pulse, and then an echo. The time between the middle of the first RF pulse and the peak of the spin echo is called the echo time (TE).
  2. SE is typically used within a pulse sequence to refocus chemical shift by pulses 90 ∘, TE/2, 180 ∘, TE/2.
See also: flip angle
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 705 [Terms] [Paper]
Citation: 'spin echo' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08420 RIS BibTex EndNote
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