Hydrogen line

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Hydrogen line by

Wikipedia Bot 0 1970-01-01

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Hydrogen line by

Ciro Santilli 32 Updated 2024-09-07 Created 1970-01-01

21 cm is very long and very low energy, because he energy split is very small!

Compare it e.g. with the hydrogen 1-2 spectral line which is 121.6 nm!

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