File:GWM HahnEchoDecay.gif

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From English Wikipedia @ Freddythechick

GWM_HahnEchoDecay.gif ‎(640 × 480 pixels, file size: 3.41 MB, MIME type: image/gif, looped, 256 frames, 10 s)

Note: Due to technical limitations, thumbnails of high resolution GIF images such as this one will not be animated.

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

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attribution share alike
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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).

Quality image

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Captions

Spin echo decay animation by Gavin W Morley.

Items portrayed in this file

depicts

inception

17 May 2011

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current17:27, 13 June 2011Thumbnail for version as of 17:27, 13 June 2011640 × 480 (3.41 MB)wikimediacommons>GavinMorleyclearer Bloch sphere
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