On a motional model for spin relaxation in liquid crystals

An alternative decoupled model is proposed to account for the correlated in ternal rotations in flexible alkyl chains of liquid crystals. Both gauche m igration and gauche pair production in the chain are now taken into account . Spectral densities of motion for deuterons on various atomic sites in the chain are predicted and compared to the experimental values in the liquid crystal 4-n-hexyloxy-4'-cyanobiphenyl. Transition rates for the chain dynam ics are discussed in conjunction with overall rotational diffusion constant s. (C) 2000 Elsevier Science B.V.