In neutron scattering by C2Cl6 the incoherent contribution to the quasi-elastic linewidth gives information on the reorientational motion of the molecules by scattering on individual atoms. The coherent scattering contains in contrast also interference effects. With polarisation analysis it is possible to distinguish between coherent and spin incoherent scattering. If it is possible to modulate the polarisation of the incoming beam one can perform high resolution TOF experiments simultaneously with polarisation analysis. On the diffractometer D7 we use 8 detectors with supermirror analysers of 10 x 5 cm2 cross-section and a supermirror polariser. A Mezei flipper supplied with a pseudostatistical pulse sequence and a second polariser generate the modulated neutron beam of one spin state. The results show that it is possible to separate the coherent and incoherent scattering peak. An analysis of the TOF data gives the relaxation times of the molecular motion