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  1. Emission spectroscopy
  2. Spectroscopy
  3. Concepts in astronomy
  4. Concepts in physics
  5. Physics
  6. Index

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Hydrogen line by Ciro Santilli 37 Updated 2025-05-26 +Created 1970-01-01
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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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