Abstract
Coherent inelastic neutron scattering has been used to obtain the dispersion curves of 1-cyanoadamantane (C10D15C identical to N) at room temperature (disordered phase). Nearly complete dispersion curves of the librational motion (librons) have been measured. A phenomenological model is used to fit these dispersion curves. For a more general Q value the structure of the rotational scattering function contains three components: an elastic peak, a quasi-elastic peak and a damped oscillator corresponding to the librational mode. The authors show that the behaviour of the elastic intensity can be connected with the static scattering S(Q) due to the correlated reorientation of the molecular threefold axis (the tumbling motion) between the different (100) cubic directions.
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