The 21 centimeter Hydrogen line comes from the hyperfine transition from its one electron, which leads to a photon with the energy of $2.24\times10^{-25}$ joules being emitted.
Can lower energy levels be achieved by any other hyperfine transition?
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1$\begingroup$ Unless there's a limit to the definition of 'hyperfine transitions,' one could imagine transitions in element 111 of rather low energy. $\endgroup$– Carl WitthoftCommented Aug 5, 2021 at 17:01
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$\begingroup$ If I may ask, what is your reasoning to achieve this conclusion? $\endgroup$– C-ConsciousnessCommented Aug 5, 2021 at 18:22
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$\begingroup$ the more electrons there are, the more levels and interacting levels, etc. $\endgroup$– Carl WitthoftCommented Aug 5, 2021 at 18:28
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$\begingroup$ I get 9.5E-25 Joules, BTW, via omnicalculator.com/physics/photon-energy $\endgroup$– Carl WitthoftCommented Aug 5, 2021 at 18:36
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$\begingroup$ Thanks for the observation on the energy level. An oversight by my part, was doing calculations for other frequencies and got them mixed up. $\endgroup$– C-ConsciousnessCommented Aug 5, 2021 at 18:42
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