Muons which had been implanted into polycrystalline or amorphous samples were studied by using transverse-field precession and longitudinal-field repolarization techniques to determine the relative fractions and natures of the diamagnetic and paramagnetic trapping sites. Cusp-like dips in the repolarization curves for polycrystalline material were associated with bond-center muonium. Similar but weaker features in the amorphous phase were tentatively attributed to the same species.

E.A.Davis, A.Singh, S.F.J.Cox: Philosophical Transactions of the Royal Society A, 1995, 350[1693], 227-36