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

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
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You are free:
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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

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

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Captions

Spin echo decay animation by Gavin W Morley.

Items portrayed in this file

depicts

creator

some value

object has role: photographer
author name string: Gavin W Morley
URL: https://commons.wikimedia.org/wiki/User:GavinMorley
Wikimedia username: GavinMorley

copyright status

copyrighted

copyright license

Creative Commons Attribution-ShareAlike 3.0 Unported

Commons quality assessment

Wikimedia Commons quality image

source of file

original creation by uploader

inception

17 May 2011

File history

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

Date/TimeThumbnailDimensionsUserComment
current16:27, 13 June 2011Thumbnail for version as of 16:27, 13 June 2011640 × 480 (3.41 MB)GavinMorleyclearer Bloch sphere
16:00, 13 June 2011Thumbnail for version as of 16:00, 13 June 2011640 × 480 (2.66 MB)GavinMorleyless bright colours, pulse sequence and graph head-on
15:31, 17 May 2011Thumbnail for version as of 15:31, 17 May 2011640 × 480 (2.34 MB)GavinMorley
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source: http://en.wikipedia.org/wiki/File:GWM_HahnEchoDecay.gif