Making Atomic Hydrogen
It takes 4.476 Electronvolt to disassociate ordinary H2 hydrogen molecules. When they recombine, they liberate this energy. An electric arc or ultraviolet photon can generate atomic hydrogen.
Atomic hydrogen can be formed under vacuum at temperatures high enough (> 2000 K) to thermally dissociate the molecule, or equivalent excitation in an electric discharge. Also, electromagnetic radiation above about 11 eV can be absorbed by H2 and lead to its dissociation.
Read more about this topic: Nascent Hydrogen
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