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of atomic hydrogen.

Here is a brief description of how they work:

*First, a beam of atomic hydrogen is produced. This is done by submitting the gas at low pressure to a high-frequency radio wave discharge (see the picture on this page).
*The next step is "state selection"--in order to get some stimulated emission, it is necessary to create a population inversion of the atoms. This is done in a way that is very

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