File:Hydrogen-SpinFlip.svg

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English: Ground state hyperfine levels of hydrogen (parallel and antiparallel) with the spin-flip transition, emitting radiation at 1420 MHz. The corresponding wavelength is 21 cm. (21-cm line, hydrogen line)
Deutsch: Wasserstoff im Grundzustand, mit magnetisch paralleler (F=1) und antiparalleler (F=0) Einstellung des Elektrons (Hyperfeinstruktur). Durch den Spin-Flip-Übergang wird ein Energiebetrag frei, der einer Frequenz von 1420 MHz entspricht. Wegen der zugehörigen Wellenlänge von 21 cm wird die Strahlung auch 21-cm Linie genannt (alternativ: Wasserstofflinie, HI-Linie).
Русский: Переход между сверхтонкими уровнями атома водорода в основном состоянии (параллельные и антипараллельные спины электрона и протона). При переходе испускается излучение на частоте 1420 МГц. соответствующее длине волны 21 см, так называемая линия нейтрального водорода 21 см.
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Author Tiltec
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current16:43, 18 January 2009Thumbnail for version as of 16:43, 18 January 2009374 × 342 (47 KB)Tiltec~commonswiki (talk | contribs)({{Information |Description={{en|1=Ground state hyperfine levels of hydrogen (parallel and antiparallel) with the spin-flip transition, emitting radiation at 1420 MHz. The corresponding wavelength is 21 cm. (21-cm line, hydrogen line)}} {{de|1=Wasserstoff
16:21, 18 January 2009Thumbnail for version as of 16:21, 18 January 2009374 × 342 (41 KB)Tiltec~commonswiki (talk | contribs){{Information |Description={{en|1=Ground state hyperfine levels of hydrogen (parallel and antiparallel) with the spin-flip transition, emitting radiation at 1420 MHz. The corresponding wavelength is 21 cm. (21-cm line, hydrogen line)}} {{de|1=Wasserstoff

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