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Hydrogen line (21 centimeter line)

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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  1. Hyperfine structure
  2. Fine structure
  3. Spectral line
  4. Emission spectrum
  5. Quantum mechanics experiment
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