File:GWM HahnEchoDecay Grey.gif
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GWM_HahnEchoDecay_Grey.gif (640 × 480 pixels, file size: 3.16 MB, MIME type: image/gif, looped, 256 frames, 13 s)
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Summary[edit]
| 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. The grey background makes this animation clearly visible with a projector, unlike the version with a black background.
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. The first frame of the animation is available here: File:GWM_HahnEchoDecay_Grey_1.jpg which is useful for a slide show. A version without the decay is available here: http://commons.wikimedia.org/wiki/File:GWM_HahnEcho_GreyBgd.gif |
| Date | |
| Source | Own work |
| Author | Gavin W Morley |
Licensing[edit]
I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- 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.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:31, 17 May 2011 | | 640 × 480 (3.16 MB) | GavinMorley (talk | contribs) |
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