Order and dynamics of molecular reorientations in norbornene: What μSR,NMR and neutrons can say

We present results from μSR and NMR on norbornene single crystals. The first two techniques provide a measure of the only non-zero rank-2 molecular order parameter in the plastic phase. Its non-vanishing value proves that molecular reorientations are not isotropic, its uniqueness indicates negligible biaxiality and its temperature dependence suggests anisotropic rotational diffusion. Preliminary analysis of single crystal IQNS supports this picture.