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- Spin_echo abstract "In magnetic resonance, a spin echo is the refocusing of spin magnetisation by a pulse of resonant electromagnetic radiation. Modern nuclear magnetic resonance (NMR) and magnetic resonance imaging make use of this effect.The NMR signal observed following an initial excitation pulse decays with time due to both spin relaxation and any inhomogeneous effects which cause different spins in the sample to precess at different rates. The first of these, relaxation, leads to an irreversible loss of magnetisation. However, the inhomogeneous dephasing can be removed by applying a 180° inversion pulse that inverts the magnetisation vectors. Examples of inhomogeneous effects include a magnetic field gradient and a distribution of chemical shifts. If the inversion pulse is applied after a period t of dephasing, the inhomogeneous evolution will rephase to form an echo at time 2t. In simple cases, the intensity of the echo relative to the initial signal is given by e−2t/T2 where T2 is the time constant for spin-spin relaxation.Echo phenomena are important features of coherent spectroscopy which have been used in fields other than magnetic resonance including laser spectroscopy and neutron scattering. Echoes were first detected in nuclear magnetic resonance by Erwin Hahn in 1950, and spin echoes are sometimes referred to as Hahn echoes. In nuclear magnetic resonance and magnetic resonance imaging, radiofrequency radiation is most commonly used.In 1972 F. Mezei introduced spin echo neutron scattering, a technique that can be used to study magnons and phonons in single crystals. The technique is now applied in research facilities using triple axis spectrometers.".
- Spin_echo thumbnail HahnEcho_GWM.gif?width=300.
- Spin_echo wikiPageExternalLink 872879.
- Spin_echo wikiPageExternalLink index.php?option=com_content&view=category&layout=blog&id=103&Itemid=271.
- Spin_echo wikiPageID "7937743".
- Spin_echo wikiPageLength "10036".
- Spin_echo wikiPageOutDegree "37".
- Spin_echo wikiPageRevisionID "666127916".
- Spin_echo wikiPageWikiLink Category:Magnetic_resonance_imaging.
- Spin_echo wikiPageWikiLink Category:Nuclear_magnetic_resonance.
- Spin_echo wikiPageWikiLink Category:Quantum_mechanics.
- Spin_echo wikiPageWikiLink Category:Scientific_techniques.
- Spin_echo wikiPageWikiLink Category:Spectroscopy.
- Spin_echo wikiPageWikiLink Chemical_shift.
- Spin_echo wikiPageWikiLink Decoherence.
- Spin_echo wikiPageWikiLink Edward_Mills_Purcell.
- Spin_echo wikiPageWikiLink Electromagnetic_radiation.
- Spin_echo wikiPageWikiLink Electron_paramagnetic_resonance.
- Spin_echo wikiPageWikiLink Erwin_Hahn.
- Spin_echo wikiPageWikiLink Exponential_decay.
- Spin_echo wikiPageWikiLink Free_induction_decay.
- Spin_echo wikiPageWikiLink Gradient_Echo.
- Spin_echo wikiPageWikiLink Herman_Carr.
- Spin_echo wikiPageWikiLink Laser_spectroscopy.
- Spin_echo wikiPageWikiLink Line_broadening.
- Spin_echo wikiPageWikiLink Magnetic_resonance_imaging.
- Spin_echo wikiPageWikiLink Neutron_spin_echo.
- Spin_echo wikiPageWikiLink Nuclear_magnetic_resonance.
- Spin_echo wikiPageWikiLink Precession.
- Spin_echo wikiPageWikiLink Quantum_decoherence.
- Spin_echo wikiPageWikiLink Radio_frequency.
- Spin_echo wikiPageWikiLink Radiofrequency.
- Spin_echo wikiPageWikiLink Relaxation_(NMR).
- Spin_echo wikiPageWikiLink Rotating_reference_frame.
- Spin_echo wikiPageWikiLink Spectral_line.
- Spin_echo wikiPageWikiLink Spectroscopy.
- Spin_echo wikiPageWikiLink Spin_(physics).
- Spin_echo wikiPageWikiLink Spin–spin_relaxation.
- Spin_echo wikiPageWikiLink File:GWM_HahnEchoDecay.gif.
- Spin_echo wikiPageWikiLink File:HahnEcho_GWM.gif.
- Spin_echo wikiPageWikiLink File:SpinEcho2_GWM.gif.
- Spin_echo wikiPageWikiLink File:SpinEcho_GWM_stills.jpg.
- Spin_echo wikiPageWikiLinkText "Hahn echo".
- Spin_echo wikiPageWikiLinkText "Spin echo".
- Spin_echo wikiPageWikiLinkText "Spin_echo".
- Spin_echo wikiPageWikiLinkText "echo".
- Spin_echo wikiPageWikiLinkText "nuclear spin echoes".
- Spin_echo wikiPageWikiLinkText "spin echo".
- Spin_echo hasPhotoCollection Spin_echo.
- Spin_echo wikiPageUsesTemplate Template:Cite_book.
- Spin_echo wikiPageUsesTemplate Template:Reflist.
- Spin_echo subject Category:Magnetic_resonance_imaging.
- Spin_echo subject Category:Nuclear_magnetic_resonance.
- Spin_echo subject Category:Quantum_mechanics.
- Spin_echo subject Category:Scientific_techniques.
- Spin_echo subject Category:Spectroscopy.
- Spin_echo type Biophysic.
- Spin_echo type Mechanic.
- Spin_echo type Physic.
- Spin_echo type Technique.
- Spin_echo comment "In magnetic resonance, a spin echo is the refocusing of spin magnetisation by a pulse of resonant electromagnetic radiation. Modern nuclear magnetic resonance (NMR) and magnetic resonance imaging make use of this effect.The NMR signal observed following an initial excitation pulse decays with time due to both spin relaxation and any inhomogeneous effects which cause different spins in the sample to precess at different rates.".
- Spin_echo label "Spin echo".
- Spin_echo sameAs Spinové_echo.
- Spin_echo sameAs Spin-Echo.
- Spin_echo sameAs Eco_de_espín.
- Spin_echo sameAs ردیف_تصویرسازی_اسپین_اکو.
- Spin_echo sameAs Spin-kaiku.
- Spin_echo sameAs スピンエコー法.
- Spin_echo sameAs Спиндік_жаңғырық.
- Spin_echo sameAs m.026ks38.
- Spin_echo sameAs Спиновое_эхо.
- Spin_echo sameAs Q904043.
- Spin_echo sameAs Q904043.
- Spin_echo sameAs 自旋迴訊.
- Spin_echo wasDerivedFrom Spin_echo?oldid=666127916.
- Spin_echo depiction HahnEcho_GWM.gif.
- Spin_echo isPrimaryTopicOf Spin_echo.