Were there this kind of experiment done before?

The spectrum we observed is radiated by huge number of hydrogen atoms in the gas, not by single hydrogen atom.

I know it's very hard to test a single atom.

  • $\begingroup$ As long as the hydrogen atoms in the gas are not interacting much, the fact that there are lots of them really doesn't matter too much. $\endgroup$ – Jon Custer Jul 2 '19 at 13:04
  • $\begingroup$ And, while not hydrogen atoms, many groups are looking at the spectra from single crystal defects, such as the nitrogen-vacancy and silicon-vacancy complexes in diamond. Those are truly isolated. $\endgroup$ – Jon Custer Jul 2 '19 at 13:06

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