HYDROSTATIC-PRESSURE AND TEMPERATURE-DEPENDENCE STUDY OF D-CAMPHOR AND DL-BORNEOLE BY NEUTRON-SCATTERING

Neutron scattering investigations have been performed down to helium t emperatures under different hydrostatic pressures up to 330 MPa, Neutr on diffraction (ND) and incoherent inelastic neutron scattering (IINS) spectra showed clearly the existence of a phase transition in d-camph or, which was not observed in dl-borneole. The ND spectra point to a p ossible cubic structure of the dl-borneole crystal down to helium temp eratures, Pressure and temperature dependence of the IINS spectra assu med a glass-like transition from the dynamical to static orientational disorder of molecules in this crystal.