The inelastic neutron scattering spectrum at 85K of a hydrofulleride sample, which had been quenched after preparation at 620K under a H pressure of 0.6GPa, was determined. The spectrum was also studied after an annealing process (300K, 35h) which reduced the H content by 1.4 H2 molecules per C60 unit. The quenched sample was shown to consist of C60Hx molecules, where x was of the order of 24, and of interstitial molecular H. The latter left the sample during annealing at room temperature, whereas the C60Hx molecules were stable at this temperature.

A.I.Kolesnikov, V.E.Antonov, I.O.Bashkin, G.Grosse, A.P.Moravsky_ A.J.Muzychka, E.G.Ponyatovsky, F.E.Wagner: Journal of Physics - Condensed Matter, 1997, 9[13], 2831-8