File:GWM HahnEchoDecay.gif

Summary

Description
English: Animation of a Hahn echo decay. This large file does not animate in Wikipedia if it is resized (as of May 2011), due to a bug. Examples of the Hahn echo include the spin echo and the photon echo. The red arrows can be thought of as spins. Applying the first pulse rotates the spins by 90 degrees, producing an equal superposition of spin up and spin down. The spins then "spread out" because each is in a slightly different environment. This spreading out looks like decoherence, but it can be refocused by a second pulse which rotates the spins by 180 degrees. Several simplifications are used in this animation: no decoherence is included until the blue graph appears, when only T2 decoherence is included. Also, each spin experiences perfect pulses during which the environment provides no spreading. Animation made by Gavin W Morley with POV-Ray 3.6 and Photoshop; some rights reserved. There is a version without the decay here: File:HahnEcho GWM.gif
Эрзянь: Копорень гайтень анимациясь невит спинэнь реакциянть (якстересэ) сэньсэ Блохонь сферасо.
Polski: Animacja echa spinowego pokazująca reakcję spinów (czerwone strzałki) w sferze Blocha (niebieska) na sekwencję impulsów (zielone).
Date
Source Own work
Author Gavin W Morley

Licensing

I, the copyright holder of this work, hereby publish it under the following license:
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
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  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Category:CC-BY-SA-3.0#GWM%20HahnEchoDecay.gifCategory:Self-published work

Assessment

Media of the day This file was selected as the media of the day for 28 June 2020. It was captioned as follows:
English: Spin echo animation showing the response of spins (red arrows) in the blue Bloch sphere to the green pulse sequence.
Other languages
English: Spin echo animation showing the response of spins (red arrows) in the blue Bloch sphere to the green pulse sequence.
Эрзянь: Копорень гайтень анимациясь невит спинэнь реакциянть (якстересэ) сэньсэ Блохонь сферасо.
Polski: Animacja echa spinowego pokazująca reakcję spinów (czerwone strzałki) w sferze Blocha (niebieska) na sekwencję impulsów (zielone).

Category:Media of the day#{{{year}}}-{{{month}}}-{{{day}}}

Quality image

This image has been assessed using the Quality image guidelines and is considered a Quality image.

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Category:Quality images#GWM%20HahnEchoDecay.gifCategory:Quality images missing SDC depicts Category:Abstract animations Category:Animated GIF files Category:Bloch spheres Category:Spin (intrinsic angular momentum) Category:Electron paramagnetic resonance Category:Spin echo Category:Animated GIF files between 50 MP and 100 MP
Category:Abstract animations Category:Animated GIF files Category:Animated GIF files between 50 MP and 100 MP Category:Bloch spheres Category:CC-BY-SA-3.0 Category:Electron paramagnetic resonance Category:Media of the day Category:Quality images Category:Quality images missing SDC depicts Category:Self-published work Category:Spin (intrinsic angular momentum) Category:Spin echo