File:GWM HahnEchoDecay.gif
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GWM_HahnEchoDecay.gif (640 × 480 pixels, file size: 3.41 MB, MIME type: image/gif, looped, 256 frames, 10 s)
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Summary[edit]
| Summary | |
|---|---|
| Description | 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 |
| Source | Wikimedia Commons file page |
| Author | Gavin W Morley |
| Permission | See original Commons license details. |
Licensing[edit]
Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
This file is licensed under the Creative Commons Attribution-ShareAlike 3.0 license.
Official license: CC BY-SA 3.0
Original attribution and file history: Wikimedia Commons
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:51, 29 May 2026 | | 640 × 480 (3.41 MB) | Maintenance script (talk | contribs) | == Summary == Importing file |
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