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Datoteka:GWM HahnEchoDecay.gif

GWM_HahnEchoDecay.gif ‎(640 × 480 piksela, veličina datoteke: 3,41 MB, MIME tip: image/gif, stalno iznova, 256 sličica, 10 s)

Sažetak

Opis
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).
Datum
Izvor Vlastito djelo
Autor Gavin W Morley

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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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Spin echo decay animation by Gavin W Morley.

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Historija datoteke

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Datum/vrijemeSmanjeni pregledDimenzijeKorisnikKomentar
trenutno18:27, 13 juni 2011Smanjeni pregled verzije na dan 18:27, 13 juni 2011640 × 480 (3,41 MB)GavinMorleyclearer Bloch sphere
18:00, 13 juni 2011Smanjeni pregled verzije na dan 18:00, 13 juni 2011640 × 480 (2,66 MB)GavinMorleyless bright colours, pulse sequence and graph head-on
17:31, 17 maj 2011Smanjeni pregled verzije na dan 17:31, 17 maj 2011640 × 480 (2,34 MB)GavinMorley

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