Orientierung nematischer Phasen im Magnetfeld

Orientation of Nematic Phases in Magnetic Fields We discuss two methods to measure the reorientation times τ_0r of the director in nematic phases of liquid crystals in an external magnetic field. Both methods give the same results; advantages and disadvantages are considered. It appears that the relation resulting from continuum theory tan Φ ∞e^?t/τ0r is fulfilled (Φ twist angle). In the appendix we discuss optimum conditions for the pulse method.