  The pair- and three-proton interaction potentials for metal-phase hydrogen
are calculated. Irreducible three-proton interactions are shown to be essential
in the development of the metal hydrogen structure. Possible manifestations of
the three-ion interactions in the structure of quickly quenched metallic
systems are discussed. Existence of amorphous metals is related to
manifestations of the three-ion interactions in non-equilibrium conditions when
amorphisation front travels through a liquid metal.
