Author/Authors :
Emil Roduner، نويسنده , , Kosmas Prassides، نويسنده , , Roderick M. Macrae، نويسنده , , Ian M. Thomas، نويسنده , , Christof Niedermayer، نويسنده , , Ulrich Binninger، نويسنده , , Christian Bernhard، نويسنده , , Anselm Hofer، نويسنده , , Ivan D. Reid، نويسنده ,
Abstract :
The dynamics of the muonium (Mu) adduct to C60 in the crystalline state have been investigated using avoided level crossing muon spin resonance (ALC-μSR). The motion of C60 in the orientationally ordered phase (T < 260 K) is well described by a spherical diffusion or isotropic jump-reorientation motion with an Arrhenius activation energy of 176(1) meV and a frequency factor of 2.95(13) × 10−12 s. This is in striking contrast to the behaviour of MuC70 adducts whose reorientational motion fits well in a pseudo-static model with a temperature dependent order parameter.
