Typically the emission of extreme ultraviolet light from hydrogen gas is achieved via a discharge at high voltage, a high power inductively coupled plasma, or a plasma created and heated to extreme temperatures by RF coupling (e.g. >106 K) with confinement provided by a toroidal magnetic field. We report the observation of intense extreme ultraviolet (EUV) emission at low temperatures (e.g. <103 K) from atomic hydrogen and certain atomized pure elements or certain gaseous ions which ionize at integer multiples of the potential energy of atomic hydrogen.
